I5 3570K OR i7 2600K

For gaming if the prices are the same I would go with the 3570k, but since the 2600k is $30 cheaper, I will go (personally) with the 2600k. Like I said before make sure the 2600k is in a good condition. For photoshop and other non-gaming programs 2600k should be an easy choice.
 

xtreme5

Distinguished

i7 and i5 are basically same chip's but i7 has only hyper-threading which is useless in games.