X4 price starts at 10.5k I think
you might get it for lower price. Someone in the forum said that the price is 9.5k.
You can couple it with Gigabyte MA78GM-US2H if you want to do moderate overclocking and Jetway HA-07 Ultra for extreme oveclocking.
Either go for HD4770 or go for HD4870/GTX260.
with little bit of overclocking HD4770 almost reaches GTS250's performance and it still runs cooler
But if you are going to get a fullHD display, you better get GTX260.