Ive been a passenger in a Z4 and all i remember from it was its boneshaking ride even on what feels in my Peugeot like a very smooth road.
Are back seats important? Because a Mercedes SLK should be attainable for that money if they're not.
If you want more of a four seater, comfortable cruiser then obviously a Mercedes CLK is an option. You can easily get a 5-6 year old one for 10k. The 270CDi is very highly rated. It may not be as fun round tight bends mind as it is a cruise mobile but it is a proper four seater. Might not fit the "be different" criteria though as it is a default surgeons car.
Something similair but a bit different could be the Volvo C70. Proper four seater, good equipment, nice looks, excellent metal folding roof. The T5 is powerful enough for most. Dont see many of them about.
If you were maybe willing to go for something with a bit of a rubbish badge you can get great value with the Peugeot 407 Coupe. Its absolutely massive, genuine four seater, nice Diesels but also a 3.0V6, very comfortable and like the Volvo you dont see many.
One like this for example.
http://www.autotrader.co.uk/classified/advert/201103377431274/sort/priceasc/usedcars/transmission/automatic/body-type/coupe/model/407/make/peugeot/radius/1500/postcode/nr162ad/page/2?logcode=p
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