Starkeeper,
Although the drums aren't the best on the PSR's, I don't think I'd find too much of an issue with them for what I plan to use the keyboard for.

I have no intentions of using it for anything "modern" like hip hop ect. I've got my synth for that. However, I'd use it for more traditional work. It would be used heavily for orchestral/classical, instrumental, and film score styles. I'll of course tweek the livin crap out of it to see how far I can push the tone generator. If Yamaha allowed tweeking of individual instruments within the drum kits on the S-900 I'd be tickled pink ... However, they'll be more than acceptable for what I plan to use the board for....

So it's gonna be either the S-700 or S-900. I could buy the S-700, then take the money I'd save on that compared to the 900's price and use the difference to purchase that new digital piano of Yamaha's (I think it's the NP-30 or something like that).