I suppose a MK6 or MK7 GTI is the only logical step forward if you like the MK5, but VW's 'legendary' build quality has left a bitter taste in your mouth.
I've been pondering a move myself, and again, what to? BMW 1 series, meh, hate them. MK6, only a half step forward from the MK5. MK7 GTI, bland looks. S3, again bland to look at. BMW 335i or something of that nature, boring. Old school E39 M5, massive ££s to maintain. M3, likewise and slow below 4000rpm. A dilemma eh?!