Do you plan to buy a new cpu chip too? The P5GDC-V is LGA775. Won't work with your current cpu.
The ASUS P4C800-E is ok, but if you're not stuck on ASUS, I'd recommend the ABIT IC7-G Max III instead. I've used both of these with a socket 478 chip and I personally thought the ABIT was the better motherboard of the two.
The P5GDC-V Deluxe is a good choice if you're planning on upgrading your cpu, and you want the option to use either DDR or DDR2, as it supports both (but not at the same time). This motherboard also uses PCI-E (versus AGP), so you'll have to upgrade your video card too.