umm...help me buy?

ok so it should be as deep as it can get (not so thick cause i am not wide there much.....yet?) and vibrate madly, which one should i buy?
and other one should be as thick as it can be (small size? cause it hurt if i try to get it deeper) and again vibrate madly, which one should i buy?
⁄(⁄ ⁄·⁄ω⁄·⁄ ⁄)⁄