For two 5870s I would recommend a 750W PSU. If you're going to get the rebate then this one is good: Antec Truepower New Blue Modular TP-750 $120 ($20 rebate). If you're not going to take the rebate then this is cheaper: Corsair 750TX $110, which has a $10 rebate.
The Hyper 212 Plus is a bit expensive on newegg atm, so either get it for a reasonable price at amazon, or this one is also very good at keeping temps down while being quiet: Scythe Mugen 2 $35 ($7.56 shipping).
Your harddrive has quite a few amazing combo deals, definitely check them out.
were you ever going to crossfire? if so then I'd go ahead and get a 850w corsair psu right now. better spend the $100+ now then another down the line. Requirements for 5870x2 is 750w so the extra hundred will give you breathing room for overclocking and running extra HDs and what not.