Looking for an old audi

[blysccr]

Hey, this is my first post here, so be nice. I"m not totally new to audi's, had an a6 2.8 quattro...it was a nice car. however i've moved on got a jeep, and i'm looking for something a little more economical and awd. i've been looking a lot at e30 325ix's, however they are hard to find, expensive, and hard to make fast. That frusturation led me to audi's. i want something from the late 80'searly 90's. what are some problems with these cars? what exactly is the difference between the 80, 90 and 100, 200. like chassis size? engine? i'm semi familiar with these, but i want to get off on the right foot and not get basic things mixed up. it is my understanding that the 200 were turboed...something i like, easy power. i also very much like the gt. can that be found awd, 5 speed and turbo? thanks guys