You should also use a dual channel kit of ram, not a single module.
CORSAIR Vengeance 4GB (2 x 2GB) 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800) Desktop Memory Model CML4GX3M2A1600C9B - Newegg.com
It doesn't hurt to go over, but all you need is a quality 400 watt PSU for a system with that video card. Raidmax is junk. To keep the cost down, this will do the job:
Antec VP-450 450W ATX 12V v2.3 Power Supply - Newegg.com
With a big full tower case, having a modular PSU really isn't that important.