BMW 3-series convertible, z3m coupé....650Ci? (scary expensive to maintain...)
Audi S5 convertible?
I assume you don't get hot hatches except the mushy Golf GTI. That one is probably too heavy to still be able to dole out fun, for a front wheel drive. If you get current Golf R's or old R32s / VR6s those might be fun - and should be just about big enough.
Seeing as you don't get French or Italian cars, I won't be able to recommend those.
If you find a Maserati Quattroporte at a reasonable price - don't even think about hesitating. That thing is probably the perfect compromise between drama and comfort. So yes, new it's a 130k, but it's been on the market for 8 years with only minor changes, so there should be some used models around that should have depreciated into more reasonable regions. In Germany at least (where the used car market does tend to be rather saturated, but also plentiful, so one of the better indicators for the European market) you can get medium mileage (30-50k) 2004-2006 models for less than 30k euros.
Or, if you like the adventure, a Merc 450 SEL 6.9.
Can get good ones for cheap, but have to deal with the hydro-pneumatic suspension, and a three-gear auto box. You do get ABS though! Still, that car is a classic, classy, and still goes pretty reasonably fast...