I'd go for the PA31. I suspect the Navajo will take 4 with clubs for 430 nm, but if not or the field is an issue how about a PNav - pressurised Navajo I think has 425 hp a side rather than 310, so should get off in 900 m and the improved max all-up and TAS at FL170 or so should get you there!
I like the Navajo. Maintenance costs are high, and I would suggest getting the heat exchangers to replace the crap heater, but it is very comfortable and capable. Have done 130 kts level with one engine feathered.
P.S. I am over 6' and comfortable in any seat of the Navajo.
Last edited by Life's a Beech; 6th Dec 2007 at 23:55.