With only $150 I need to know the best graphics card deal I can get. If it helps any, the only games I will play with it are Half-Life 2 and Counter-Strike: Source.
I believe that the best bang for that buck could be the ATI 9800pro. Especially if you'r playing the HL engine. (Unless you want a PCIe of course, in which case I'll have to go with the 6600gt). Check it out: http://www.newegg.com/Product/Product.asp?item=N82E16814102477 http://www.newegg.com/Product/Product.asp?item=N82E16814140047
Yea unless you want to upgrade your mobo ot a PCI-E one, you should get the 9800pro or 9800XT. You can get a 6600GT AGP but they cost more than the native PCI-E ones.