Hello, I'm trying to decide on a 27 iMac. I am browsing the refurb store and see three models I'm interested in... One model is the 2.66 i5 with the 4850 Radeon with 512MB memory Another is the 2.8 i5 with the 5750 Radeon with 1GB memory Another is the 2.8 i7 with the 4850 Radeon, 512MB. The 2.8 i5 and i7 are the same price, video card only difference. The 2.66 is last years model, and cheaper by $170. Reading a MacWorld review of the models, the difference between the 2.66 i5 and 2.8 is negligible, with the biggest difference a 35% increase in frame rate in CoD because of the updated video card. Now, I game. Mostly on XBox 360 but being the geek I am would be interested in expanding to the Mac for some Steam and Windows gaming via Bootcamp. Is the difference worth it for the 5750 vs. 4850? Would the i7 provide a performance boost offsetting the fact it has the older graphics card? Lots of decisions going on in my mind, and I'd like this to be the last Mac I buy for a few years. If I can get the cheaper i5 and get comparible performance to the other 2 I'd like that as that is amost $200. Would love users opinions on these 3, thank you for your help in my decision!