Go here for a video card comparison chart. It includes most recent cards except for the newest Radeon 9700 from ATI (which blows away the Ti4600).

In regards to the MicroCenter advertisment for a WD 120GB drive, the ad was a misprint. It had the correct SKU# but listed the cache as being "8MB" when it should have said "2MB". Although this was immediately recognized, many people used (unscrupulously) the printed ad to receive price matches at various local stores before the stores found out that it was a misprint. Believe me, I was having dreams of a 360GB RAID monster setup for about $100