OK my $0.02.
After the Ibiza (130PS? 310Nm I'm guessing) I would steer clear of the RX8. They have a really sweet handling chassis but peak torque is really high in the rev range and not that high. My mum has the same model Ibiza and the surge as it tries to headbutt the horizon never ceases to amaze me and I reckon you will miss that. Plus your fuel bills are going to rocket.
Does it have to be petrol? I'm not that familiar with what is available but BMW and Mercedes surely make a few diesel RWD coupes that would give the thrills without the bills?