Seems like dropping your car off to get work done is pretty convenient?

With that and having a spare vehicle I would probably run the Dart as long as its not so rusty its a pain to work on. For new vehicles with a manual you are left with the Forte, Mazda3, and Civic as comparable cars, and I suspect they don't really do anything much better than the Dart?
Also have you tried sitting in the passenger seat for lunch?
I don't know what the reliability rep is for the Dart, but for my Focus, nothing really driveline critical seems to be a common problem? So I just drive it, sometimes for a week or two with a blown shock, or a slightly clunky ball joint, bad motor mount, etc, until I have a convenient time to mess with it, or in your case, fit it in at a slow time at work.