<< Berkeley has a good reputation but rents are atrocious and its in the middle of a smallish city and I find it dirty >>
No dirtier than LA, and the city is no smaller than Riverside/Santa Barbara and most other college towns.
<< UCSC is full of weed-smokers and is not for the academic minded individual, as it seems to be the easiest UC to get into, and i believe that you can go there and not get a GPA (old rule?) >>
They have some good programs there actually, and their 5-year MA Econ program is very intriguing to me. But you're right, they're known more for being a partying than academically. The environment is as good as it gets though, being right next to the beach and all. And if you head over to epinions.com, the people that went there give lots of credit to their professors and all.
<< UCSD i hear is nice but antisocial, no personal experience there >>
It's pretty close to San Diego St., which is one of the most social places out there.