Join Date: Jul 2007
Bikes: 1997 Schwinn Searcher GS, 2007 Dahon Curve D3
If your godson is a BMX mechanic, he likely won't know much about folders, and might laugh at the idea.
Although you don't envision commuting with it, you will still need one with a small fold if you want to take it on planes. So that takes out the 20" wheel models.
For everything else you mention, 20" wheels seem to be ideal. Throwing in the trunk --> no problem. Packing on planes --> problem.
I like the Dahons. Good quality, fair price. There are others that are better quality, but then you have to grab your ankles for the price. There are others that are priced lower, but then there are design problems and quality problems.
Admittedly, I have never tried a Downtube, which also seem to be pretty popular here. (and a contender with Dahon for the price) Dahons run from about $200 to $2000, depending on how fancy of a bike you want. Above about $400, you get less and less for your money.