2k for BD home theater is quite tight. 3k will be just nice

Since you are looking for Samsung TV, just go to get Samsung home theater set. It will be easier to use same brand for less headache later. I am sure those electronic store you buy TV will have some home theater set as well.

Well no brand is perfect in everything. So unless you really know what you are doing, mix and match can be a big headache and may cost more money

Well I personally prefer like pioneer and Sony. As long as you know what you are doing is fine because different brand can have compatibility issue and other things that you didn't thought of. Good luck hunting ☺️

let say u are buying everything new.
encore xls speaker rm1300, av receiver rm1400, bd player rm400, cable etc.
later u can add on subwoofer rm1600, small satelites for surround rm1000 and a good center channel rm1500.

total spent will be rm7200

You mentioned 5.1 but most soundbar is actually 2.1.

The cheapest to have 5.1 is to buy home theater system, which normally consist of DVD (or BD) player and surround speakers + sub-woofer.

They are about same price for same power rating. Price is related to power output and additional feature. If you want to buy separate system probably more than 3k for good one, but if you really do, just estimate that the speakers price take at least 50% of the budget

encore xls speaker rm1300, can give some bass so u wont miss subwoofer for a while. seller is fx20
av receiver rm1400, pick entry level among denon-yamaha-pioneer-onkyo. i would take denon x series (theater) or s series (slim)
bd player rm400 (see japanese brands)
installation & cable etc... survey shops from ur location

kinggerard for 3k - budget just can get Pioneer 329k with AJ speaker & woofer (5.1) which is still much better than htib. i think good for starter.

i m using pioneer 524k with AJ speakers minus the woofer and i have Samsung Blu-ray HTIB F6550. the pioneer even lower range are still alot better than Top range HTIB imho.

I have no idea since I'm not in KL/Selangor area. You just have to compare around. Perhaps you can find out the shop that supply to smaller shop, they can sell cheaper. However, they will not undercut her retailer shops 

Normally small shop you have to wait for reason "out of stock". Actually they never stock anything expensive, only get the unit once customer order. This can be your advantage also because you can actually ask for much lower price since they have no stocking cost, order and direct sell to customer. Their margin (not sure on audio/video stuff) perhaps 20~30% estimated 

i no sifu here, just casual user for movies only. if you want good warranty you can try to get at senq for 329k set. last time 323k was sold for 2,899 or 2,999, the 329k is latest model imnm there are selling for 3199 or 3299 now. other place you can try if you are at kv is harvey norman or desa ht. at hn for those entry level sets they also sell quite competitive price. i seen before they sell pioneer 323k (display) with new AJ spk/woofer set for rm1999 from the usual price 2999 during clearance which is good bargain. for budget less than 3.5k not much can be done. . as cheap amp like Pioneer 329k, Yamaha rx v377 or Denon x500 cost 1-1.5k. not much $ left for others parts.

for compatibility i think its universal.

all price mention is inclusive of amp, and 5.1 spk/woofer

you can check at pioneer web, this is 323k set, basically the same except that the amp change to 329k..
http://www.pioneer.my/my/products-detail/i...oduct=HTP-AJ323

New? Impossible. The ringgit is too shitty to have that kind of privilege.

Second or third hand, possible. But you're going to have to hunt quite hard for it.

Get a receiver for around 1k, get 5 speakers for 1.5k, get a fart box for 1k.
Difficult to recommend any and don't expect a great audio experience.

My suggestion, forget 5.1. Put all your money into 2.0 and be happy until you have funds to add more speakers:
- RM1.4k for a Yamaha v383
- RM2k for Klipsch RP150 or Q Acoustics Concept 20 or Elac Debut B6. If you have the space and want towers, Sony SS-CS3 towers aren't too bad for the price (around RM1.5k).

The very bare minimum where I would consider a not-pointless setup for HT purposes (does not apply to HiFi music):

Sony SS-CS5 Bookshelfs L/R = RM700
Sony SS-CS8 Center = RM500
Sony SS-CS5 Bookshelfs surround = RM700
Klipsch R10sw sub = RM1.8k
Yamaha RXV-383 AVR = RM1.4k

or

SVS Prime Satellite 5.1 package = RM5.3k (SRP, actual price is quite a bit lower - ask htkaki/maxx audio to check)

You could go cheaper and pick up some second or third hand speakers for even cheaper, but that depends on luck and your willingness to hunt for them. That goes the same for the receiver, you can look at hifi4sale to see if anyone is selling off their 1 or 2 year old receivers, could find something worthwhile there. I think this serves a baseline (in Msia at least) for a new set of speakers on a 5.1 setup that doesn't sound like shit.

Beyond this budget (say if you have around 8-10k), then your horizons open up to SVS subs, Q Acoustics Speakers, KEF Q speakers, Jamo C90 series speakers, SVS Prime series speakers, Rega speakers, or Klipsch RP series speakers for example.

Not going to list out every range of setups, better for you to list your budget first instead.

Go thank the you-know-who finance minister.

For 8-10k, I can only give you some recommendations - the most important thing is that you will have to go listen to them to get an idea of how they sound. Do keep in mind that room acoustics plays a major role, so what you hear in a demo room may not be what you hear in your own space.

Example setup:

Klipsch RP150 = RM1.9k
Klipsch RP450c = RM2.5k
Mission VX-S Sattellites = RM900
SVS PB1000 = RM3.6k
Yamaha RXV383 AVR = RM1.4k

Alternatively;

SVS Prime Satellite 5.1 package = RM5k
Marantz SR5011, Denon x2300w or Yamaha v683 AVR = RM2.5k

You could then sell the SB1000 sub if it's not enough output for you for a bigger SVS sub like the PB1000 or better yet a PB2000 or PC2000. Alternatively, you could also add another SB1000 to make it a multi-sub setup, which in most cases is significantly better over a single sub setup simply due to better room response (gives you more even/linear bass over multiple seats instead of just one sweetspot), a bigger headroom and some SPL gain (not much though).
Of course, choosing a sub depends entirely on the room dimensions and location you are putting it in.

The prices here are SRP, so ask around and you may get lower prices (especially the subs).