jmooney,
Welcome to the forum!
Here's a couple good site for you to check, both have loads of Tech articles and other info that will be of help. There's even a few links on how to buy an older Vette. I couldn't even begin to tell you everything here. Both years are good, and both have their own bad points depending on how you look at it. This site (Corvette Action Center) is also a great resource for getting solutions to problems, there's plenty of talented people here who have busted knuckles from fixing their cars.
http://www.l81vetteregistry.com/
http://www.sharkwerkes.com/sharktank/
Here's some things to think about too;
Are you going to keep it stock, or modify it?
Do you have smog-nazis where you live?
Will this be a daily driver?
Are you mechanically inclined, or will you have to pay to have work done?
Do you have to have a "matching numbers" car?
Also, get a copy of the "Corvette Black Book" at your local bookstore, it will give you the specifics of each year Corvette...great book!
Oh ya, and what Steve said! Just keep in mind you are buying a car that is 20 years old....it will need repairs eventually. Get the car on a lift if possible too, inspect everything! Contact the local Vette club and see if someone will go with you to inspect a car you might like.