After looking through countless amounts of aicraft xplanes (not the game) on a list on Wikipedia I found two that would be really cool and fun to make.

The first, Convair xc-99
http://www.airliners.net/search/phot...rs.net%2F&ref=

The next is the very sleep and very fast looking xf-87
http://en.wikipedia.org/wiki/Curtiss...F-87_Blackhawk

Enjoy, see what you can do...