Getting a 24 inch iMac very soon. Been trying to decide between the 2.66GHz and the 2.93 GHz computers. Processors aside, the main difference seems to be the Graphics card. Not a heavy gamer and don't do a lot of graphics/video work. Just wondering which system I should get? There is also a refurb previous gen 3.06 that is around the same price as the new 2.93. If I should get a dedicated graphics card, should I go with the refurb, GT120, or splurge for the GT 130 (or dare I say wait for the ATI card)?