Trying to decide between a refurb 24" 2.93 with the GT120 (4gb/640HD) and a new 21"imac 3.06 base model, or should I spring for the ATI card . No gaming, but want the best graphics performance for the web, and some occasional video editing ( iMovie-Final Cut Express ). Screen size not really an issue.In fact, the smaller screen may be better for glare issues. Eligible for the educational discount.