So I'm pulling this back up because I'm going to experiment a little with my Mofi.  The unit that Ubifi sells is supposed to support Verizon, which is a bit faster at my place than AT&T.  It looks like Verizon has an unlimited pre-paid plan for $70/mo but, it's going to be a little bit of a hassle to get it.  I think I know what I need to do, buy a cheap Verizon hotspot, activate a SIM and them put it into the Mofi, so I'm going to give it a go and see what happens.
I also see an AT&T unlimited pre-paid plan for $30/mo, the only catch is it might get prioritized after 22GB.  I've got a bunch of AT&T SIMs here to try that with as well.  I'm not really sure whether I want faster or cheaper though.  Anyway, I'm going to goof about with it and report back with my findings.  It'll take a couple of months at Lea because I know I'm too cheap to waste data I've paid for.  LOL