The TDI is going to have the highest upkeep cost according to consumer reports, the timing belts tend to break if not replaced every 70,000 miles and it's great if you can replace them your self but friends with TDI's and other VW's have them in for repairs more then anyone else I know.
As far as I know you are not going to find a Geo Metro with cruse control and the engine is fussy to add aftermarket cruse control onto and if I was driving that much I would want cruse control.
With a $7,000 budget, I'd opt for a Honda Insight, even if you had to travel a bit to get it.
Other option would be to find a first or 2nd gen Toyota Prius and learn how to rebuild the battery pack, a few people in our local EV club have done that a handful of times and say it's not a bad way to get a cheap car.
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