Haven't ridden the 10R, but I'd recommend at least sitting on an R1 (if you can't weasel a ride). I sat on a ZX-10, and for me it felt a little too small and cramped. I also thought the R1 was a little better looking and more polished and refined, but that's me. But if you're thinking of jumping, maybe hold out until you see an 05 Gixxer. I've seen the pics too, and thought "What the hell?" But then again, sometimes, seeing one in person makes all the difference (ie. Ducati 999). Also, with an exhaust that thing might look loads better. Besides, it'll probably make sh!tloads of power, too...
Of course, I prefer the R1, and I really couldn't care less if the new Zook'll make 5 more horses, or if the ZX-10 does better wheelies. Ultimately, the one that moves your soul is the one to buy. Good luck!