Thanks for replies.
I do play Doom3 but have been playing HL2 loads recently and i know i'll be playing CS:S loads too
Infact it was HL2 that made me want a new card.
My current card plays it well enough but i feel cheated that i cannot run it in DX9 mode without a massive performance hit!
I wanna see the nice reflective water effects. I even reinstalled my old radeon 9600 to see them but it didn't play as smooth as i liked!
So yea, Source engine games are what i want running tip top foremost.
ALSO i've fallen in love with STALKER as it looks gorgeous!! So i will be playing that too!