1. I agree; a 750W should be more than enough. But if you don't plan to SLI or CrossFire, a 650W is enough.
2. H100 isn't great either. Very expensive and doesn't perform better than a heatsink.
Thatss why i pick 850w coe i maybe getting Crosfire later on not shure yet, just wanted some spare power.
What cooler wood you advice me then to go with?