Korni,
None of the aircraft you list will have a range of a 1,000 nm, and with a BN2 you will need a calendar to measure the flight time.
The Beech Queen Air has been long out of production and the engines require very gentle handling to avoid catastrophic failure. A Cessna 402 or Piper Navajo would do the job and I know the Navajo can come with a potty seat although you wouldn't want to be shy and retiring to have to use it. However, neither has the range. A Commander 500 would also work at a pinch although pax don't like them but pilots do.
A piston pressurised twin would work except for range but a turbine wouldn't with a lot of low level flight eating up fuel.
As for STOL I have flown both Cessna 402 and Piper Chieftain aircraft out of 800 metre strips at near MTOW. The Chieftain is better because you have a flap option that brings it off at a lower airspeed but you are on a knife edge until the aircraft accelerates. They can both handle relatively rough airstrips.
Hope this gives some ideas.
Last edited by PLovett; 22nd Apr 2010 at 01:48.
Reason: Correcting a mong mistake