i haven't gotten to college yet and I'm torn between going to a (relatively cheap) school or going to the more expensive school.  The one is about $5000 more per year, so that's $20,000 more after 4 years.  Of course, the average income is much higher for graduates at that school.  Hopefully, I'll be able to get some loans that I don't have to start paying off until after I graduate (Stafford, for example)
but yeah, it's a fun topic to think about.