Personally, my first bike was Yamaha R1. My friends started with a 600 and they wanted a 1000 not long after that. But, you have to be very conscience of what you're doing and really about your surroundings.

Pay attention in the safe driving class. I took one when I was 17 and it helped me a ton. Remember what they teach you and apply it, especially when you're learning.

I have owned several, hmm, well, actually a lot more than several motorcycles...probably more than 50, and have ridden at least 3 times as many that were not mine. I would have to say that one of the most comfortable bikes I have ridden in the basic sport bike class that is affordable is a Yamaha. They handle incredible...they practically ride themselves and are very forgiving on rider error for the money. I ride a BMW bike now if you are wondering and also have a Ducati for performance riding. These are not what you would call beginner bike though. A Yamaha FJ600 is a good choice. Added note: When riding, ALWAYS stay as far away from automobiles as feasibly allows. If you reside in a state that permits "lane splitting" make sure the auto motorists know you are there before you get close to them. Lastly don't get just an OK or good helmet, get the best one you can buy. Cant stress that enough!