your best bet would be the Sapphire HD5750 512MB, currently Thundermatch is selling it for RM410, not sure if they still have stock though. Otherwise go for GTS250 512MB, RM390 from Thundermatch too.

This post has been edited by phantomash: Jul 18 2010, 11:17 PM

DX11 aside, HD5750 have slightly better performance than both the HD4850 and GTS250, while consuming much less power, and also runs at lower temperature.
The only problem is finding the Sapphire 512MB version, as this card is getting out of stock in many stores.
The 1GB version although is easily available but it does not offer much more performance boost while costing about RM50+- more.

This post has been edited by phantomash: Jul 19 2010, 12:13 AM