Cheyennes
Hi jdbb,
I've flown Piper Cheyenne I, II XL and 400LS a number of years ago. If you're stepping up from a Seneca, the 400LS is too far away, too dicey to handle (at least on the t/o-run), too expensive to operate and with parts difficult to locate (only 45 built - 2 known crashes).
My boss did the same: I wanted the King Air, but it was too costly then. A King Air has many obvious advantages, but you have to face reality.
A Cheyenne Ia is a good compromise and probably cheap to get. You don't know what's going to be next. Maybe you'll have a nice little jet under your seat some time soon...
Good luck!