I suggest a Better PSU, such as the 550 Watt Antec or the 520 Watt OCZ. A Hiper 580 WAtt is also a very good choice. You will have alot of room for upgrades/new build.
And for the heatsink, Zalman 9700, TT big typhoon, Scythe Ninja, XP 90/120. Take your Pick along with Artic Silver 5.
As for the cooling situation just use all fan slots provided by Case and if Need be get some high CFM Ones. You can add Fan slots on the sides by cutting out 80MM or 120MM Holes. Or any size you want for that matter.