Martin,
Let me reinforce your decision to keep your Jeep.  Even the cost of a new motor is less expensive than a whole new car. Same goes for the other biggies.  As long as you can keep the body in good shape (salted roads, GGGRR!) just continue to budget a car payment anyway as a way of getting ready for a new motor.  Once you build up the necessary "payments" any additional "payments" made into the budget can go towards vacations and other things.  I think you are on the right track.
I understand the commute thing.  When I was performing in a theater company in Morrisville we had a couple of guys that commuted to The City every day, 2 hours one-way.  They loved the Manhattan wage and PA cost of living differntial.
MoBOB
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"Its not a matter of being ready as it is being prepared" -- B. E. J. Taylor