Go make some
and just sit back & don't take offence to the comments you are about to recieve.
The 2 best stuntbikes are the F4i 01-06 CBR600, and the Kawi636 03-06. The 01-06 F4i is the same bike except for the tail section. 01-03 have the split style tail, and 04-06 have the banana seat. if you pick up a 04-06 F4i the rear tail from a 01-03 is a direct swap. You just need the subframe, tail, seats, battery tray, & everything from the sub back.
People seem to like the 03/04 636 for stunting more than the 05/06 but they are all great stuntbikes.
The 636 has more power but is more fragile.
The F4i is the strongest suntbike out there. it has the strongest frame, subframe, rearset, its just built like a tank. The throttle is very forgiving & not sensitive. And it has a huge ballence point.
You probably won't be disapointed with eather. Most start on a F4i because it is so strong, and when they stop crashing so much alot of people switch to the 636 cause its a better looking bike and has more power.