I'd vote for the Twin Star. 150Kt TAS cruise at 80% power and 6 USG Jet A1 per side. Turn off one engine and you save 4-5 gals per hour
Turbo normalising means it is good at altitude, water cooling means no shock cooling issues, strong aeroplane with all mod cons (not to mention G1000). Get the TKS anti-ice system and you're good to go most of the year. You must be able to fit a weather radar
.....Oh, and it has the second engine and flies very well on only one.
How much do you want to spend?