Thing is HD4870X2 may not be out til end of Aug. That's a LONG wait for us computer users who are usually impatient. Are you 100% sure nvidia will sit their rear out while Ati run them over? Hell, no. They'll come up with something. Then you're back in the wait game. Sep. No, Nov. Scratch that, 2010.
nvidia cut prices of 9800GTX, GTX 260 & 280. Look at the your games' benchmarks and pick out the winner.