Find whatever glasses you want, its no pressure. you should like them, not hide behind them. All high end glasses can have their lenses punched out and prescription ones put in, so feel free to shop high fashion brands and so on :-] (
http://www.supremenewyork.com/shop/accessories/alton-sunglasses/tortoise)
Take them into your shower. I do this all the time. I take them into the shower and usually soap up the nosepads and rims or whatever. This functions to a) keep them clean and looking
fly and b) to help reduce skin oils that cause them to slide over time
Whenever you go on a vacation, throw in cleaning solution and a wipe. Nothings worse than a smudge. Sometimes it is fun to play with it and adjust your prospective as to make it look like its bouncing and so on.
When people try them on and are like "woooahhhh your so blind". Just remember they are retarded and the prescription wasn't written for their cracker ass.
Sometimes when doing strenuous activities you debate whether to keep them on or take them off. Honestly this is the hardest part about wearing glasses. Just don't get sports glasses they are gay as fuck.
If you get a smudge and its setting off OCD just take it to a sink, rinse lenses with soap and water, and air dry via blowing on them. Like in car washes.
Follow those things and you'll be set. I recommend shopping on RayBan and maybe consulting your girlfriend. I've got RB 5154 2000 and I think they look fine.