actually, i used to own a 2000 jetta TDI and i couldn't wait to get rid of it. there were many stupid engineering errors with those cars, so you could be getting into a world of frustration if you go with the jetta. you may luck out and not have any problems as long as you own the car, but i would definitely do a carfax report on any jetta you look at (tdi or not) and visit
http://www.tdiclub.com and read up on maintenence and reliability issues with the jetta.