That sounds like a fun way to spend the end of the year getting ready for next year and Vista with DX 10 right around the corner.
Just one suggestion (probably too late, uh?) I would put two seagate med size GB 10k sata HDD's in a zero array (in place of the 72k HDD's) and use a big external sata or usb 2.0 or firewire for files like movies, photo's etc.
Yes, you have good taste ... Let us know how the duo-core works out ... Have my eye on that one too ... Don't hesitate to use water cooling if you over clock and take a look at the new ATI video card with plasma cooling built in.
