I've never driven an Rx7 but I had a 240sx for a while. Reliable, fast, cheap, and decent gas mileage. I think I was getting mid to upper 20s for gas mileage.
http://minneapolis.craigslist.org/hn...908287799.html
If I had the money I'd pick up a 240. And they're stupid easy to work on. I can only imagine what a rotary would be like to work on.