SAPPHIRE 100243-1GL Radeon HD 4870 1GB 256-bit GDDR5 PCI Express 2.0 x16 HDCP Ready CrossFire Supported Video Card
(PSU not a problem/won't be upgrading)
I could upgrade by the end of the summer with 600 dollars, or wait until the end of next summer and have about 1200 dollars. I"m kind of leaning towards next summer, because I'm happy with my system, but any advice/opinions would be welcome.
If you're happy with your system, as you say, there's no reason to upgrade now. If it's the urge to build (been gnawing on me too lately!), perhaps you have a family member or friend who would appreciate your building a system for them.