Official system requirements

[Riddlin]

Looking for some help. Can't do a complete 'rebuild' of my entire rig yet but when I built this one 3-4 years ago it was with the HOPE that I could upgrade at least once before I HAD to build again.

ASUS P5K-E/WIFI-AP LGA 775 Intel P35 ATX Intel Motherboard
Intel Core 2 Quad Q6600 Kentsfield 2.4GHz LGA 775 95W Quad-Core Processor (OC'd to 3.36 and have ran it stable with HUGE Fan/HS to a quite a bit faster)
CORSAIR XMS2 2GB(2 x 1GB) 240-Pin DDR2 SDRAM DDR2 800 (PC2 6400) Dual Channel
EVGA GeForce 8800GT Superclocked 512MB 256-bit GDDR3 PCI Express 2.0 x16
OS = WinXP 32

So, I was thinking at first I would just upgrade the video card since the 2GB RAM limits on XP makes upgrading to 4GB RAM kinda silly until I can get Win7 64.

What are your thoughts? Like I said, I am really stuck with the MoBo for now so, is it worth upgrading or just wait a year and rebuild a new one from the ground up?

Thanks in advance!
R