You're asking the wrong question...for a timeframe that long, the platform will be more important than the chip (either will be fine).
What do you connect to the system now, and what will you add?
How many SATA devices will you need?
How many USB devices (USB Hubs can be dodgey)?
How many PCI or PCIe slots?
Onboard graphics or video card?
HDMI, Firewire, etc...?
Edit...oops, missed your last post.
For the graphics, ATI is releasing new cards in the next few weeks, soall prices will likely drop again if you can wait.
What do you connect to the system now, and what will you add?
How many SATA devices will you need?
How many USB devices (USB Hubs can be dodgey)?
How many PCI or PCIe slots?
Onboard graphics or video card?
HDMI, Firewire, etc...?
Edit...oops, missed your last post.
For the graphics, ATI is releasing new cards in the next few weeks, soall prices will likely drop again if you can wait.