I have commuted to school (WSUV) every other day this week. I am currently using an backpack and a drawstring bag to carry my school stuff and extra clothes. Currently I just bungie them onto my bike rack. I think that I would be able to ride every day if I had a little extra carrying capacity which I why I am going to get a pair of panniers. I have come up with two options:

First Option:
Timbuk2 Bullitt - for school stuff
Cheap detour pannier - for clothes and shoes.
Total: ~$145

Second Option:
A pair of Ortlieb classic panniers
Total: ~$165

Does anyone have any experience with these bags?