I need some advice with an iMac purchase. If I go brand new, the 21.5" with the 6770M is in my price range. However, a refurbished 27", i7, with the HD 5750 card is about the same price. So basically, the refurbished has a bigger screen, a faster processor, and more graphics memory (1 gig vs. 512mb). However the graphics card is an older one. The other major difference is no Thunderbolt, which I'm not sure is a deal breaker. My main use of the computer will be Audio production which I know either will be totally fine for - I'm mostly concerned with gaming. Does the 5750 suck or will it be fine for basic gaming like CS:Source, Portal 2, BF etc. I'm usually annoyed by these kind of posts because they are so relative - but I'm really torn at what to do here... Thanks in advance!