What is a good beginner sport bike with good power?

Tbh you don't want a big bike to start off, I'd go for a 125 or 250 rs or cbr, but if you want a bigger bike and got money go for a zx9r, cbr or hyabusa but you will kill yourself if your not very carefull

cbr250r or ninja 250r. those are pretty much your only options.

Stay away from the Ninja's, high insurance. Suzuki Bandit 400, 600 or 650. As already suggested Suzuki SV 650, super agile & very responsive but too tall to call a sport bike & IMO not really a beginners bike.

My vote goes to the Kawasaki EX500. It's a great beginner bike that isn't too powerful, but will still put a grin on your face and the insurance isn't bad at all. They made the EX for years so parts/labor is still inexpensive. It isn't a bike you'll outgrow in a year or two because it will keep you entertained for some time. I sold my EX500 8 years ago but I often wish I still had it.

And bring on the clowns!.. http://www.youtube.com/watch?v=BGflpQoKVMY&feature=related http://www.youtube.com/watch?v=gNgTW-ZwxFw http://www.youtube.com/watch?v=3RDdPl-pd14&feature=related http://www.youtube.com/watch?v=9T7oD4Yegmg http://www.youtube.com/watch?v=8WeggQKbszk&feature=related http://www.ebaumsworld.com/video/watch/80602574/

There is no such thing as a beginner sport bike with lots of power. That = dead. The Ex500 is a great beginner fun bike. More power than you can use for a couple of years.