My new Trading Computer

Is it my computer, or has this market slowed considerably.

I'm looking for a new CPU, as some of you noticed my system dates back to the times of the great Dinosaur, so its time to update, and I want some feedback in picking my system.

Requirements-
Cost- Keep it between $500-1,000

Processor- Intel Core 2, Quad, or AMD x2 64, or the new quad phenom
Ram- minimum 2GB DDR2, between 2-4GB ideal
Hard drive- Preferably 250GB-500GB, with at least 8mg cache
Video Card- Needs to be dual head- preferably Nividia brand and minimum 512mb
Operating System- Doesn't matter, People say XP is still faster until the next Vista update comes out, but buying the "backbones" without an OS installed is an option that will save money.

What I'm looking at-
Fry's: $499- HP a6177c Refurbished (Intel® Core™ 2 Duo Processor E6550, 2GB, 400GB, Vista Premium)

ebaY: $659- Intel Quad Core Q6600 Custom Gaming PC System, 3 year warranty, DVDRW, 2GB DDR2, 320GB HDD, GeForce



eCost: $849- 2.4GHz Intel® Core™ 2 Quad Q6600, 3GB RAM, 640GB Hard Drive, Dual Layer DVD±RW, HD DVD-ROM, Wireless LAN 802.11 b/g, GeForce 8400GS, TV Tuner Card w/ FM Tuner, Windows Vista™ Home Premium (HP Recertified Model)

ebaY: $948- AMD QUAD CORE PHENOM 9500/ 4GB DDR-2/500GB HDD 512MB 8500GT / 20X DVD-RW/BRAND NEW/3 - YEAR WARRANTY



I would prefer to go to a store and buy it, such as buying a refurbished model from Fry's, but I'm looking into buying one online if the deal is good enough.

Please leave your comments on which one you think I should get, or if you find something better below $1,000, leave me a comment. THANKS!

After I get a new CPU, I'll be looking to get some new monitors.