I have been looking about for a while now for a change to a z4 and have come across two that i quite like. First is a black Alpina Z4 3.4ltr year is 2004 (54) done 72K mls. lovely looker with sat nav, full service history for £11495. or. Red Z4 ///m also lovely looking car 2006 (o6) done 60K mls. with sat nav full history for £11950. Third is a Z3 silver 2000 plate 3ltr also with full service and only done 7000 mls. one owner from new for £10k. I'm looking for opinions realy as it would be a complete change over to go to 4 series and i know that there's a lot of experience out there who can say if these are overpriced and which they would go for. So any advice please?