Rene 
2005 BMW Z4 Convertible 2.5i 2dr Roadster (2.5L 6cyl 5M)
Only 2.0L but still a lot of fun
 I went for the 2.0L rather than 3.0L (the in between 2.5L made no sense to me) because it is a long term car so running costs are important.  The lighter engine means this is the best handling car I have ever driven.  I can blast round beds, be they sharp corners or sweepers at speeds that make my hair tingle.  I used to race stock cars and have had a Morgan +8 - the Zed 4 is better.  Blasted across Germany at 90-120mph and got 41 miles per gallon.  I live in London and still get 30mpg.  I love the looks (pre-facelift) and always stare at the car when leaving it.  Driving does not get much better.