Heyyo,
I highly suggest the 9600 Pro. That Nvidia Geforce 5200 is PURE CRAP. The ATI 9000 Pro could kick the 5200's arse easily... that's a sign dude... and trying to make that 5200 a 256mb video card? lmao, that's hallarious... it still makes the card crappy, and you'll barely see an increase in frames, if any... On the benchmark the 5500 isin't shown, so just look at the 5600 for a guess... I used to own a 5600, but I sold it off cause the card sucked, n' I bought a 9600 Pro.
Also, the source engine (the game engine HL2 is built on) is optimized for ATI cards, making the gap between those 2 nividia cards, and that ATI 9600 Pro, even bigger.
want proof? check this benchmark out, it shows many different cards benchmarked on many different games the 1st game is ut2003:
http://graphics.tomshardware.com/gra...ournament_2003