i5 2500k. I was in the same dilemma last night and bought the 2500k after canceling my FX-8150 order. The power usage was the killer for me. The performance I can deal with but not at the cost of so much more wattage.
If you game: 2500K
If you do general computer work (web browsing, email, office work, etc.): 2500K
If you do large amounts of rendering/video manipulation: Depends on what application you use. I would probably go with a 2600K
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