Ah, a topic near and dear to my heart. I've been trying to convince myself to upgrade too. My rig is 4.5 years old, and while it's done an admirable job, it's showing it's age. Normally I wouldn't wait this long to upgrade, but it was a beast when I built it (1.5GB of ram in '02), it can no longer handle the work.
I was going to buy it in May but then Dell had that monitor sale and I finally picked up the 24inch wide screen that I've had my eye on for the last year. BTW, if anyone is interested, I have a $75 off coupon for Dell that I'm not going to use.
Anyway, here's the specs on what I'm considering (Apologies for long winded descriptions copied from newegg):
-Antec LifeStyle SONATA II Piano Black Steel ATX Mid Tower Computer Case 450Watt SmartPower 2.0 Power Supply
-ASUS P5B Deluxe LGA 775 Intel P965 Express ATX Intel Motherboard
-Intel Core 2 Duo E6700 Conroe 2.66GHz LGA 775 Processor
-CORSAIR XMS2 4GB(2 x 2GB) 240-Pin DDR2 SDRAM DDR2 800 (PC2 6400) Dual Channel Kit
-Western Digital Raptor WD1500ADFD 150GB 10,000 RPM Serial ATA150 Hard Drive
-LITE-ON 20X DVD±R DVD Burner with LightScribe Black SATA
-EVGA 640-P2-N821-AR GeForce 8800GTS 640MB GDDR3 PCI Express x16 HDCP Video Card
The Raptor would be my boot drive and at some point in the future I would consider picking up a couple data drives in Raid0 (probably have to get a stronger power supply if I do).
I would also run Vista 64 on this, since I can get a copy free through our MSDN at work.
I probably have another month of psyching myself up to spend this much money, but I think I'll cave soon. Only took me 6 months to psych myself into buying the video ipod