Need Advice on computer build for work

Hello Everyone!


APPROXIMATE PURCHASE DATE: Some time this month.

BUDGET RANGE: 500-700, This is not a set price budget. Just a area I would like to be in.

SYSTEM USAGE: Business/ Gaming once a blue moon? My system focus is to be build around as a trading machine (Futures Market).

PARTS NOT REQUIRED:

1)Keyboard
2)Mouse
3)Video Card??? I would like to use the 2 PCI ATI cards that I have now.
4)Old hard drive as a backup.
5)3g of DDR2 Ram. I am hoping I can reuse this ram on the new build.

PREFERRED WEBSITE(S) FOR PARTS:

1) NewEgg.com
2) Mwave.com
3) frys.com
4) xoxide.com

ANY OTHER SITES ANYONE CAN SUGGEST?

PARTS PREFERENCES: Not to sure on this one. This is were I need help! I would like to go with AMD Phenom II X4 965 Processor, OR Intel I7 920 Processor.

OVERCLOCKING: Yes, to a safe level though... I plan on getting 3-4yrs use out of this computer, hopefully no additional upgrades will be needed.


ADDITIONAL COMMENTS:

Right now I run 3 monitors for trading futures... They all run at 1280 x 1024.

Things I will need help on choosing/Suggestions.
1) Power Supply? Nothing over kill
2) Mother board? MSI, Gigabyte? I would like to have a on board audio input/output, Ethernet, video card, & atleast 1-2 PCI slots.
3) Processor:
4) Cases: Antec, 300,900 & 1200; Coolmaster 690; Nzxt tempest gaming.
5) Ram: 3-4g

PLEASE FEEL FREE TO SUGGEST ANYTHING TO ME.


Thanks in Advance!