The Tecnam P2006 is a pure training aircraft, not suitable for anything else IMO. Range, speed, operating ceiling and surprisingly poor finish quality wouldn't justify the $450k as a personal aircraft.
A Rotax 914 (i.e. turbo) version of the P2006 wouldn't be that great either because first of all, the 914 got a shorter TBO than the 912S and most importantly, the 914 does not like AVGAS 100LL.
The TwinCo is a great aircraft but that is no secret so used market prices are quite high for such an old bird.