Have you considered something more common, like a Beagle 206? Kidding aside, the Commander is a perfect example of why I think pressurized airplanes are pointless without turbine engines: They're just too heavy. Even the ones that just sort of work, after you've flown the turbine version, I guarantee you'll be a convert. A Dash 10 powered Commander, 441, Merlin or MU-2 goes/climbs fast, caries a bunch of fat people, and is ten times more reliable than any geared, turbo-super charged (boat anchor) powered piston twin…and it costs accordingly -- for good reason. The aforementioned airplanes will cruise between 290- 310kts at 25000ft. A piston airplane that can climb that high (with any payload) is a trace of rime away from having to descend to the low teens. Turboprops are industrial products…even the best piston twins are sort of like sears best.