To be honest, this cooler will not do any better than that air setup. The PURE is more for silence. If you don't want to hear it, the PURE will be better. If you don't care about sound, get a 75CFM fan on that Noctua and it will cool better. BUT, the Pure will keep it under 65C even up to 3.2GHz.
Intel E6300/Nouctua NH-9U w/dual 92mm Panaflos
XFX 680i LT
Patriot PC2-6400 2X2GB LL
2 X BFG 8800GTX in SLI
Enermax Revolution 620W PSU
ASUS 24X DVD/Seagate 250GB SATA 2/THermaltake A90/Windows 7 Ultimate 64