Buy a Mooney. They're fast, economical, and reliable. I flight plan 150 knots @ 10gph. They have 4 seats although they are not as roomey as a C182. But if you only use four seats occasioally, they're ideal. Mooneys are all retractable which adds maintenance but if you get an E or C model with the manual gear system the costs are negligble. Very stable IFR airplane.
Good luck in your search.
