I need to put together a workstation that I will use primarily for video editing (Premiere Pro CS4 and Vegas 8). I really have nothing at this point that can edit HD comfortably in CS4.

I'm looking for the following:

• Intel Quad Core, at least 2.8 GHz (3.2 would be better) Comparable AMD Phenom might be okay, but it must support SSE2.
• 4 gig of RAM though 6 would be better, and expandable up to 16 would be nice
• Reasonably fast OpenGL 2.0–compatible graphics card with HDMI output (dual head would be better -- 1 HDMI/1 15-pin VGA)
• 1394/Firewire port
• Gigabit NIC
• Enough open drive bays for at least 2 SATA drives -- 4 or 5 would be better
• A couple of PCIe slots open
• At least a couple of USB 2.0 on the back of the case
• Power supply sufficient to drive all this (300-350 watt minimum)
• Operating System should be either XP Pro, Vista Business or Vista Home Premium, 32-bit (64-bit acceptable)

It doesn't need to come with:
- drives of any kind, including DVD, except for a main drive of any size to hold the O/S
- monitor
- keyboard and mouse
- any other software
- any of the usual junk they bundle with computers

Price: $600 or less and available mail-order outside of CA so I don't have to pay tax.

I have, for the last 20 years or so, always built my own workstations from scratch but I have neither the time nor inclination to try to match together the components I need, go shopping for them, and assemble them. I'd rather just add drives, plug in my existing monitor, keyboard, etc. and get going.

I am completely unfamiliar with the market for branded computers, e.g. Dell or HP, having encountered them only at work and finding them way underpowered for HD video editing. I saw this:

http://www.buy.com/prod/HP-Pavilion-...210902522.html

but the processor is a bit underpowered and I don't know if it can be overclocked. I'm okay with a refurb.

Any suggestions would be appreciated.

And, no, I will not "buy a Mac," so please don't take this thread in that direction.