Hi Wendell,
There's an easy solution to your dilemma - buy one of each!

IMHO there are pros and cons to each; the 50's has much more cool factor/head turner and uniqueness, while the 72 should have more get up and go, for example. But if you can only get one truck right now, get the one that pulls at your heart the most (then later you can get the other as your second truck). And I like the term Bolterellas!
Samantha