e30 vert's are decent, no real problems that hard tops don't have, just the usual cam belt issues, i've never just replaced the top cloth i usually have a car with a good one installed and replace the frame and all, it's about 6 bolts and a setting up the shims, if you do just the top don't forget the tension straps i thing they are a couple hundred and required according to my upolstery guy. i've seen hard tops on the bay for between 1000 and 1500.
if the car is solid $1100 sounds good but it will probably need some work