For the PSU, the higher the number (Amps) on the +12v side is better. The one you have listed is good for 34Amps. I personally look for one with 50A or better. That not only gives me enough juice for max load if need be, but also future use if I want to add a GPU or upgrade something.
This is the one I just bought:
Newegg.com - SeaSonic M12II 750 SS-750AM 750W ATX12V / EPS12V SLI Ready 80 PLUS BRONZE Certified Modular Active PFC Semi-modular Power Supply
the PSU is one of those things, that you get what you pay for... I'm not saying you should get top of the line, but you definitely don't want to skimp on it. The rest of your system will pay for it.
I also assume you have an OS as well? I didn't read that you had one. if not, you'll need to budget for that, unless you plan on using ubuntu, or some other type of free OS.