Here's some of the main things you want to look for in a videocard.
-Core clock speed
-Memory clock speed
-# of Pixel pipelins
-what kind of memory i.e.: GDDR2, GDDR3, DDR
-Memory interface i.e.: 256 bit,128 bit, 64 bit.
-Amount of memory i.e. 128mb, 256mb, 512mb
basically that's it.
Also the GPU, like the name of the card. For exapmle a 6600gt, ar a 7800gt.
New build in progress, but this is what I got for now:
-AMD x2 5200+
-Asus M3A78-EM AM2+
-Buffalo 2x1gb ddr2 800
-Hitachi 250gb Sata HDD
-Antec Minuet Case w/ 350w psu
-Windows 7 Home Premium 64 bit