I had an MGF which used the K Series which are the unreliable ones...BUT only due to a poor gasket design, and generally inadequate cooling system, the engine itself is actually very good.
BUT in my opinion a ZS or a coupe isn't even a choice, it'd be a coupe all the way. Bear in mind that MG parts are now pretty expensive if anything does go wrong too.
I would definately have another MGF, but only because i know them inside out now. If you haven;t had an MG/Rover before then i wouldn't recommend it, by the time you learn all the quirks you've already shelled out a crap load of money in repairs. That was why i sold mine, even though when i sold it it was basically like new, i was sick of the thing by then! I do miss my MGF though
EDIT: Head over to forums.mg-rover.org and have a chat with some of the guys that own ZS's and read through some of the help sections to get a feel for what they're like. good guys over there, very helpful and mountains of info.
