Thank you for the responses! Tri Girl- I do love cargo bikes, but the storage facility at my job is up 3 flights of stairs. there is an elevator but it is pretty small. When I commute on my regular bike it fits pretty snugly in there.

hebe- I will definitely have to test ride the Vita. I didn't know they accepted front racks! Good to know.

Eden- a trailer is cheaper than a bike, it's true. But from my searches on craigslist around here not markedly so. People are selling the real high-end trailers and so even on craigslist they're over $400. I think I can buy some of the lower end ones cheaper. Also, shopping for (and justifying) a new bike is more fun than trailer shopping.