Ditto what Ray said re State Farm and McGraw (based on what I've read and heard); however, seems like I've heard you need your autos and/or home insured with State Farm to get the low bike rate.
I get a low rate from Geico but I think it's because I have my cars with them and I've been with them since the planet was formed

.
When you look into it, you'll find some folks love outfits like Geico and Progressive, and others hate them with a passion. Beats me

. You'll probably have to do some comparison shopping.
Regarding full coverage on older bikes, you'll just have to do the math and assess whether you might want to "self insure". If comprehensive and collision costs two to three hundred per year, and the bike is only worth a two to three thousand, you may want to skip this coverage (assuming you can afford to replace your bike if stolen or totaled). Individual decision.
Good luck,
Bill K.