Welcome to another Bostonian. I bought my 2000 here in NE (VT) last year. My take on this one is that the price will probably have to come down significantly to make it a good deal, unless it has very very little rust on it. Based on what I see around here, $11k is what a 2000 with about that mileage would go for in the south.
Read the link in my sig for some of the problems that a life in new england will give it. You should look closely at the undercarriage for severe rust, specifically:
The rear axle housing from the back - if it is rusty, scrape it and see if the rust flakes off, how thick the rust is (bring a flat head screwdriver with you to scrape), and see if the rust on the diff cover area looks wet. If it looks wet, then you probably have an oil leak. You might be able to smell it too if you know what gear oil smells like)
The gas tank/filler pipe - Just make sure there is nothing more than little patches of rust on the tank, squeeze the filler pipe to make sure it hasn't rusted through.
The frame - check around where the rear lower control arms attach to the frame, check both the inside side and the outside side of the main frame rail there. Surface rust is ok, but if you have any holes, don't get it.
People have mentioned the rear axle seals - This doesn't worry me as much because it is fairly easy and cheap to replace these, and I don't think they are likely to empty the diff the way a housing or diff seal leak will.
For comparison, mine is seen in my build thread in my sig, and I paid $7600 with 100kmi. I feel like I overpaid for what I got. I had to drop a quick $1G just to fix the rusty fuel filler pipe, new rear axle, and other small parts and supplies just to get it drivable. I will need to replace the front brakes as one of the bleeder valves is frozen in, so I can't bleed it. My suspension was shot, most likely primarily due to the rust damage. A big kicker was that my frame is actually pretty good. It is bad in the spare tire area (not really structural). It didn't come with a spare tire (got stolen the week before I bought it.
Anyway, feel free to message me if you want to know more. Is this thing located down on the cape? Mass has some pretty good used car buyer protection laws; beware if it is a different state.