I would recommend that before you buy a car, that you ask people on this forum for a ride in their car. There are MANY flavours of 02's, and I would recommend that you at least test a few to get a feel for what you prefer.
Most owners here would be more than willing to let you test their cars, you just have to ask.
As for prices and repair costs, it depends. It is usually cheaper to buy a more expensive car that runs well than to fix one up, so make sure that (especially the engine on the tii) the car runs well.
Rust should be your main concern as it is the most expensive problem to fix, make sure that someone that knows these cars inspect it for rust.
Find a car that is already modified the way you like if at all possible, getting shops to to do the work for you will be more expensive.
As for value, tii's, roundies, euro bumpered and stock cars command the highest prices and will continue to do so. (I'm omitting the more rare 02s)
But THE best advice I can give you, is to not rush things. Take your time, go test drive cars, keep searching and educating yourself and you will most likely find a car that makes you happy.
Best regards
Jacques
Edit: Btw, a well sorted 02 is a pleasure to drive, these cars handle great, can stop quickly, have light controls and can be very reliable. The only thing that shows its age is the cabin noise, but I like that because it adds to the driving experience.