I'm surprised nobody has yet mentioned the Partenavia P68B, although they are not very common.
I flew one in Oz a while back, lovely plane with a nice cockpit which you have to enter from between the pilot seats having entered the plane through the door at the back which makes it feel big and 'airline' like!
Comes with 2x200hp lycoming IO-360s, basically arrow engines, 6 seats, 140kt cruise, fixed gear solid enough for rough strips, good payload, but watch W&B when solo.
Also comes with 330hp turboprops!!
I think there is one at Elstree for hire, and a syndicate running a nice model at Denham.
For picture see
http://www.airliners.net/open.file/570966/M/