Hi Moss, Dave W always talks good sense. I would add that as my tin top does about 26 mpg, max 30 mpg, I really enjoy hitting mid 40s to 50mpg in my 4/4 (2007 1.8 Duratec). Sort of balances the books in my mind.
Choice is really a personal thing. Whilst my second hand 4/4 cost more than a new Sport, its bespoke nature made up for that. I like getting the most out of a smaller engine and actually find in top gear it matches the pace of most things on motorways and is really engaging say touring the Lake District. Best thing is drive a few and see how you feel but I view the 4/4 as a low tax green machine with attitude and a good investment long term.
I'm sure you'll find something to suit you and give you lots of fun.
