Silmarwen: Trust me, TRUST ME. If you forsee even 1 move in the near future, much less 2 or 3, wait for the 55 gallon. It's a pain in the student's gluteal (which is already sore from hours of uncomfortable library chair usage) to move a tank. It may also disrupt your biological filter, and or cause stress and susceptibility to disease for your fish (and maybe even for you??).
Shrimp tanks are indeed lovely, much easier to care for, and very fascinating! Just don't let your drunk visitors pour vodka in the tank. Bad news for your shrimps.
I take it the vodka issue has become a problem before? That would suck so bad!
As far as the tank goes, though, I actually don't know yet if moving will be an issue for a few years. I'm graduating, but may be beginning grad school at the same university anyway. If moving does become an issue, I'll move the tank back home at least a month before I have to start packing everything else, and leave it there permanently. Otherwise, I'll sell it to a local friend--another aquarium lover--who has a home in the 'burbs. (How about that--stability! What a novel thought.)
I really want to gift my parents with a 55g (or bigger, even!) anyway, since we left ours behind when we moved 8 years ago from Maryland to Michigan. Mom always regretted it, so I wanted to make up for it (They probably could have done it without three hooligans like my brothers and I to occupy them!).
Nevertheless, it's still really just in the pipe dreaming stage at the moment. The biggest I can realistically see myself with in the next few months is 25 gallons, but only if Dad decides to be generous with the doting-upon-his-daughter again, haha.
In the meantime, I will probably just content myself with nanos and plants. *dreamy sigh*