Glock 26, in a Galco pocket holster.
Capro, it's nice to be young and full of dreams and hopes, but ugly reality will soon drop down onto you out of the sky. Picture a boot stomping on a human face, forever. Your chances of legal carry on the UW campus can best be described as similar to proton decay -- theoretically possible, but never observed in practice so far.
Best of luck to you. Personally, I carried for years where it was quite illegal. Keep it small, keep it hidden at all costs (unless it's necessary to draw, anyway). I would suggest either a small .32 (Seecamp, Beretta) or a S&W Airweight .38. With a little ingenuity, nobody will have the slightest clue that it's there.
The derringers look neat, but get one in an effective caliber and your hand will hate you for buying it. I got rid of mine after perhaps a dozen rounds through it (.40S&W "American Derringer" DA -- I DON'T recommend them for other reasons as well). The NAA minirevolvers are pretty cute, but completely ineffective -- the only positive self-defense story I've heard about them was some guy who kept it in his truck; his girlfriend was attacked by some bum, and she grabbed it and shoved it up the guy's nose. That got his attention. [:D] .25ACPs are likewise ineffective, but at least slightly better IMHO.
If you do it, though, you'll have to keep in mind that you WILL be thrown out of school if caught. College campuses are singularly intolerant of peoples' rights (all of them, not just self-defense rights), and UW's reputation in this regard is particularly poor.