JZapp,
Welcome to the boards! Overall the 95 is a good year for the Gen I's, last year for side pipes.
Here are a few answers to your questions.
*As for maintenance, I would say it is middle of the road, not over the top providing you get a good car. Like any car luck plays a part of it and doing your homework on your purchase.
An oil change will cost you $55 to do it yourself and tires mount and balanced are around $1400 with a good deal. I have not had to many problems with my 95, and all the ones I have had so far (knock on wood) were before the warranty ran out.
*You can put a hardtop on any year viper whether it came with one from the factory or not. There are quite a few vendors out there that sale them, plus you can usually find used ones too. I would look to buy one with the top already.
*The original windows are zipper and canvas, kind of like a jeep. Junk in my opinion. Quite a few vendors also sale windows that look good, with hard glass. They more or less just slide in slots of the door and a screw holds them in.
*A good place to look for a used Viper is
www.autotrader.com or the classifieds section of the forum.
Here is a picture to show you what the windows look like.
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