Hi to all sifu here
I wish to get some recommended PSU for my current rig as below my sign.
As my CM GX 550 just "kaboom" yesterday, not really sure why it is boomed too without turn on the pc yet but the switch button was always on as i have 3 extension plugging together with 2 PC. So I will not go back with that PSU again.

Any PSU can support well as my current rig below? Any cheap budget would be RM 300-350, it is better if it is below RM 300 and i wish to do SLI for the future( and maybe not just getting a better single gpu)

Im eye-ing on Seasonic SILENCE PRO 80 - 750watts 80Plus. Is it overkill with my current rig below?

Hi guys, would a gold rated 850W PSU be enough for a Core i7 2600K, 1 SSD, 4 x HDDs, 2 optical drives and 1 GTX580?

Also would the same PSU be able to support SLI GTX580?

Here is my Spec:-

Core i5 2400
Gigabyte H61 MOBO
ASUS GTS450(OC ver)
4Gb ram
Sony DVD
Samsing 1TB
WD 1TB
Currently using Huntkey Balance King 450W & I dont like the sound it make when playing games (usually high graphic games) so I'm thinking for  better replacement at the end of this month. I will scout shop around my town 1st . What PSU you guys recommend for my rig?

Edit
After scouting, here the PSU I found(within my budget RM200):

AVF 750W (RM 140 only? sounds too good to be true, has 2x12v rail 22W)
FSP Hexa 500 RM 1xx (If I want to buy might as well negotiate for less abit)
CM Extremepower 550
Xigmatek 500W (this one very expensive)