I learned on a suzuki katana 600. I think it was perfect. It's got go if you punch it but its also great to go slow on. I've known people that have gotten 250's and 500's. They say that it was a bad idea because they got tired of the small engine fast... but thats them... some people learn slower than others. so maybe a small bike is good if you wanna take ur time. but i think my 600 was fine.

by the way... its for sale if anyone is interested. 95' suzuki katana 600. brand new paint and tires. PM me if interested.