kuroyume0161, we seem to have similar systems.
This is a post I put in last month. (It's been overclocked a bit)
All of this has been installed into a pure aluminum case; to keep things nice and cool.
(Total cost... just over $1000)

I’m getting a new custom built computer to replace my old one; and these are the selected parts that will go into it:

* ASUS P5B-PLUS INTEL motherboard*

4GB of KINGSTON HYPER memory

INTEL CORE 2 QUAD 2.4GHZ

XFX GEFORCE 8600 GT 256MB DDR3 540MHZ PCI EXPRESS

1 HITACHI 160GB Hard Drive for my “C drive”

2 HITACHI 320GB Hard drives for backup

* 
And my O/S will be “Ubuntu”*

(Have to wait on that O/S, needs more driver updates) (So, I'm using XP pro 64 bit)