Bah! Horsepower Shmorsepower -- real men tune for torque
On a more serious note, here's a primer on how to determine optimum shift points for a given torque curve
http://www.allpar.com/eek/hp-vs-torque.html;
Horsepower needs to be where you can get at it (within a viable RPM range) for it to be most useful. For the bikes tuned to peak out their HP at the high revs, your general rule of thumb may be to redline it in each gear if a big ol' twin sidles up to you at the stop light and gives you a cheesy grin. I'd have to run the numbers to verify that though.
