Heh, that's a whole different situation. I love getting new parts as much as the next person, but your rig is pretty solid at the moment. Save your cash, there's some halfway credible rumors hinting that there's some nice stuff coming out this summer in the videocard department. Might even fall within EVGA's step-up program if you're really lucky (just remember to register the card).
If you're determined to do something now, refine what you already have. Run a slew of game benchmarks as-is, pull another couple hundred MHz out of that CPU, and see how much improvement you get (or don't). Grab an aftermarket cooler on that 9800GTX and see if you're can't clock it a little higher.
__________________ i7 2600K | ASUS Maximus IV GENE-Z | GTX Titan | Corsair DDR3-2133 |