dlcooper.
Look into the King-Air series, 90 & 200 have very similar operating costs, but the 300 although a touch more expensive to operate also has much better performance figures. A 200 with full fuel is no longer a 8 pax machine if you adhere to the numbers. Also for personal use look into "N" reg.
PM me if I can be of any help, I fly them for a living.
Maintenance and spares are also alot easier to come by due to numbers.