Having ridden both the '04 R1 and the 10R, and seeing how peaky their revbands are, I would say go for an older R1 (or maybe a GSXR1000). My 2000 R1 felt SO much stronger below, say, 8000 rpm than these two that I couldn't believe it. Its an undersquare long-stroke diesel compared to the new bikes' high-revving Honda v-tecs. That said, it still has a raging top end, it just doesn't feel like it has a turbo bolted on.
This low-end torque, along with the R1's short wheelbase, make it probably the easiest wheelieing bike ever made. Even with a relatively tall top gear (about 80 in first gear) you can clutch it up at about 15 mph and ride all the way through redline which ends up being a pretty decently long wheelie if you get it high enough. I am too scared to shift during wheelies and probably always will be, knowing a couple guys who looped their bikes trying to shift. But the older, high-torque, shorter-geared R1 is the wheelie machine for all time. Jumping from the older R1 to the newer bikes is like night and day. Torque has been sacrificed for top-end power. High torque makes wheelies much easier in my opinion. I had a hard time doing any wheelies with my first bike, a GSXR600. They were so easy with the R1 that now I can loft one just about anywhere at anytime, though I would rather spend my time in the turns.