The obvious choices for a fast new single, for mainly UK non-airways flying, today are
Socata TB20
Cirrus (only N-reg so need FAA licenses to get full use)
Diamond DA40 (diesel option)
The above are below say £250k+VAT.
I fly the TB20. A great aircraft. But composites are the future, without question. Just make sure you can get the avionics you want (a problem in the Diamond and to a lesser degree in the Cirrus) and that you can get reasonably local servicing and warranty work.
Above that, a very interesting one is the Grob 140 at 1.2M Euro, available later this year, they reckon...
After that, it's a lot more money for pressurised turboprops...