Best graphics/video card for under 250 dollars?

well i want a graphics card that fits my pc but not sure which one can some experts help me well here is my pc info: http://h10025.www1.hp.com/ewfrf/wc/prodinfoCategory?lc=en&cc=us&dlc=en&os=228&product=1843637&lang=en well first i want to be able to play direct x9 and x10 when i upgrade to vista and... show more well i want a graphics card that fits my pc but not sure which one can some experts help me

well here is my pc info:
http://h10025.www1.hp.com/ewfrf/wc/prodinfoCategory?lc=en&cc=us&dlc=en&os=228&product=1843637&lang=en

well first i want to be able to play direct x9 and x10 when i upgrade to vista and well...wel just a graphics cards that can do anything like watch hd video and stuff

and mmm i got the ati radeon xpress 200 and i want to add dual or even tree monitors in the future

well kinda like multimedia

oh and ill will upgrade my power suply but not sure which one can some help me in that too

thanx in advance
Update: GeForce 8800 GT is like 250 do you guys recomend that?
Update 2: btw dont show me some online special's i dont really shop online
Update 3: i would like to play at full settings of games
Update 4: is ATI Radeon 3800 series will be better than the 8800gt? and how much will it cost ? is it directs x9 and x10 compatible ? or which will be better?
Update 5: what good power supply will fit my system with some good wattage?
Update 6: Jason T : well the geforce 8800GT is better that 8800GTS so you safung that the Radeon 3870
i like the 8800GTS well then THE 8800GT is stronger than the Radeon 3870 am i right based on the information you gave me?
am i rihgt ppl?

so ppl are saying that GEFORCE 8800GT owneds the RADEON 3870 ?
Update 7: btw there alot of versions of the GEFORCE8800GT which one is the best or what are the diference iam talking about like evga, bfg,asus,xfx like found on neweggdotcom?
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