I used to own a low mileage 2002 S54 Z3 M Coupe clown-shoe, all sorts of Dinan goodies installed when Steve still actually owned Dinan. It sold in 48 hours with a bidding war in 2008.
My 2013 X1 N55 with Ultimate package is the closest I've gotten to that old Z3 feel with only minor upgrades. This car is a true sleeper.
It KBBs out at 13k with only 50k on it. I'd pay much more than that for the fun we've had together and I can still fit two 29er mountain bikes in the back without having to defile it with roof racks.