Just holdon to the GTX Tom. At 1920x1200 it's the fastest card out there and beats both the new GT and GTS. If you've had it more than ~6 months you'll have gotten great value out of it. Next step is the nvidia 9800 (or whatever it ends up being called) when it arrives. At that point it'll be an upgrade worth having at ~x2 the power of the 8800GTX, DX10.1, lower power consumption and enhanced DX10 performance even (at similar clock for clock speeds as the G80).
You've got a great GPU for your gaming res, don't get suckered into the "I want an new toy, oops i've now got nvidias slowest current card because I believed the hype" thing that's going on here from people that really should know better than expect something for nothing.