Since "affordable" is a somewhat relative term, I would like to sell my 1/4 interest in a Cherokee 6. You have to need a plane that truly carries 5 adults and some bagage for 5 hours but if you do, a partnership is more affordable than owning the whole thing yourself. The aircraft is located in Shelton, WA. Specs and photos can be seen at http://www.flydiver.com/piper.htm
You can also buy the whole thing if you are really flush with cash.

Art