I believe u're talking abt i5 2500k, it is the 2nd fastest CPU just behind 2600k & not expensive at all.

2500K vs 2600K
2600K has HT and 2MB extra L3 cache
There are several games that take advantage of HT. To name a few, MOH, Civ5, Lost Planet 2, F1, etc..
The extra cache doesnt really give enough boost to ur system.
The extra RM300 for 2600K u would probably go for 2500K + SSD and still get 5GHz 
SSD gives significant performance gain than HT in whole system, considering the most bottleneck part in ur PC is HDD.

60Gb SSD is already enuf to installed OS+some apps

from the link u give,you can give a try to Asrock Z68 Pro3 = AUD135/RM440
or
if u can wait a little bit,go for Asrock Z68 Extreme 4 Gene 3 

dang,Asrock really designing a good board+the aggressive price tag that they put....
i.....must.......resist.....

oh yes..my HDD is rly the main thing bringing my rig down but SSDs are expensive. If get the cheapest 60gb SSD...its still not enough for windows OS itself right?

And could some1 please look through this list and tell me which motherboard is good. I don expect much, just some mild OC on my future i5 (targeting 4Ghz).
http://www.msy.com.au/Parts/PARTS.pdf

price is in Aussie dollar...so expect like 50RM more expensive or more..lol.

SB is pretty easy to hit 5GHz, almost every chip can do that on any mobo.
For me Asus Maximus IV Extreme-Z is the best 1155 mobo in the market. But since it's not listed in ur PDF & no budget stated why not grab the Asus P8Z68 Deluxe. Bang for bucks is still the Pro.

Asus

Gigabyte Z68XP-UD3,this one how much bro??i has onboard 20GB SSD...looks interesting to me....