I'd keep the Mazda. Learn how it works. The regular maintenance stuff like tune ups, belts, oil, cooling, is the same as a piston engine. The basic operation is pretty straight forward. Only when you get deeper into the ignition system or major mechanical issues do you need extended knowledge of the rotary. I could argue that many maintenance tasks are easier than on a piston engine. 1985 is a unique year for those, model GSL-SE had the 13b engine. Do you know what engine is in it? If it's the carburetorated 12b there's a few odd things a mechanic can run into. There's a few basic pieces of information to know to keep it running. Older rotary engines such as your should always be brought up to operating temperature before turning it off (short trips). Never ever ever let it run low on oil. Be sure the metering oil pump works. Don't use synthetic motor oil. There are experts out there that can help you. I have a 1987 turbo RX-7. I love that car. And I do my own mechanic work.
