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There is a big difference between the imac i5 (2009) and i5 (2010) ?

A simple answer is 10-20% better all around depending on what you're using it for.

More complex answers can be found in the top50 threads in the iMac forum. :)
 
Depends on what you do. For gaming the new one is better but the previous gen is a lot bigger bang for your buck
 
i also got it refurbished, because too many $$$ of difference, plus in one year i intend to upgrade when (i hope) Apple will release imacs with hdmi and usb 3 or esata. So in 11 months when new models will arrive i will lose less money on selling this imac 27.
 
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