I just recently... like two weeks ago... purchased parts for a system very similar to the one in your list (LURVE! PCPartPicker!).
I went with the i5-3750k because I felt it was a better value. It's not that much under the i7, performance-wise, and less expensive.
I think you would get by very well with a "smaller" power supply.
The case is awesome! Bigger than I thought, and you'd have to try really really hard to get something to overheat in there, especially with the extra 200mm fan (woot! for red LEDs!).
Everything is running like a top and near silently. Anyway... that's my 2p.