looking at new video card i know my power supply has 2x 6 pin power connectors for the video card but i might only have around 150 maybe 130 to spend and i myax resolution on my monitor is 1600 x 900 and i play witcher 2 i know some of my system mgiht be out of date than what is on the market right now but here is my specs
AMD phenom x4 9600 2.3 GHZ
corsair dominator ram 4 GB at 1066 mhz ddr2
western digital black hard drive 7200 RPM 64 MB cache
BFG nvidia geforce 9500 GT (yes i know not a gaming card lol)
OCZ gamexstream 700w power supply (it has the power connectors i need to hook up a gaming video card)
motherboard is a Asus M4N78 Pro (can upgrade the processor a six core processor thanks to a bios update if i want)
also i have another 4 GB i can put into the system also so can go to 8 GB
For that kind of money an HD6850 would be quite good for your resolution. This one is cheap and a good choice; http://www.newegg.com/Product/Product.aspx?Item=N82E168...
Or for a bit more this one comes with 3 games(that are actually good even); http://www.newegg.com/Product/ComboDealDetails.aspx?Ite...
You are really going to want to upgrade that processor however. The original Phenom architecture wasn't particularly good and 2.3ghz is going to hold back any decent card. The Witcher 2 specifically is quite CPU intensive. You don't need a x6 though unless you know you use the computer for tasks that will properly utilize that many cores(gaming is not one of those things.) If you are willing to overclock then any Phenom II x4 would be a good choice apart from the 840(it is actually an Athlon II.) If not then I'd go for a 955 or 965. This is a good deal with the promo code; http://www.newegg.com/Product/Product.aspx?Item=N82E168...