I just picked up an EG hatch(92-95 civic hatchback) for $600. My buddy needed it gone and I needed better gas mileage and less miles on the car then my current DD(93 Sentra) which was getting high 20's, and had 195K on the clock. The hatch has 134K on it, runs great, is 5-speed. Hes gotten upto 52mpg on it, but mostly in the mid 40's. The fender caved in when the tire blew out and coated the whole side of the car in rubber. A few minutes with a dent puller and some brake cleaner, and its hardly noticeable, and now I can open the door.
I too drive about an hour each way, to work though, and it adds up quick. Get a cheap civic, and use the money you save on the Z.