Finally bit the bullet. I actually reverted to a modified version of the previous setup for the sake of time. While the extra speed of the t9300 would have been nice, it was ultimately cheaper for me to configure a system at 2.0 Ghz and it will save the time of re-installing Vista on a new HD.
It ended up costing me $772 (with tax) shipped for the 2 Ghz duo, 15.4" XGA+, 8600mGT, 160GB 7200rpm drive, Vista Home Premium, Webcam, Dell Wireless N, Bluetooth, 6-cell battery, CD burner, etc. I've already got two 2GB sticks ready to pop in, so I should be flying along whenever this sucker ships. My prospective ship date is the 28th right now.
Thanks again OP!