I am in the same place you are, norman. College students are not the only ones on a budget. So are those of us with families!
If I can find a head and cab for $400-$600 that would be great. I am checking eBay and the classifieds in talkbass.com. One thing that you may consider is the type of player you are. If you play a lot of solos and runs on the higher strings, then look for something with 10" speakers. But if you are more of a pocket player you might go with 12's or 15's.