First off, I would highly recommend getting full coverage. The chances of you wrecking the thing are just too high, regardless of your skill level. If you dont believe me, browse these forums, plenty of expirienced riders getting into wrecks. And it really sucks having to pay on a bike that has been totalled.
If you dont get that, at least get medical. Again, ER visits get expansive.
Now to the main question. In my expirience, bike insurance is cheaper than car insurance. I pay less to insure a '05 zx10 than an '02 f150.
But a great deal of that depends on the company, and the location at which the bike is registered. Call different companies, see how much the quote differ. A great many people had success with state farm, because they dont seem to diffirentiate the bike by class (cruiser vs sportbike) but rather just by CC. It cost me the same to insure a z1000 (street bike) as it did a zx10 (race rep), since both of them are 1000cc.
Also, if you live in a large metroplex area (this is the shady part) see if you can register your bike at the adress of some relatives that live in a little podunk town in the middle of knowhere. Insure the bike there as well, make sure your bills go there, and your registration papers. I dont know how legal that is, but your chances of getting caught are pretty slim. If you call upon your insurance and they ask about the adress, tell them you just moved. Or you were out visiting.