Not sure what your exact application is to be, but, if club 4 seats works, best bet in my opinion is a Beech Baron 58. Have experience on all of the above (in sales too in a previous life) and all are costly to maintain.....Navajo / Chietain is nice in offereing cabin type class comfort but for African conditions......58 Baron wins everytime! Forget about pressurization in a light twin if you are operating off short dirt strips. Also drives costs up.....seen plenty of blown turbo-chargers in my time....but it did help my workshop profits though!