I have to say that there's nothing inherently wrong with 27" wheels, but I'd never buy a new set of them. Whatever came on the bike, or a take-off set: Sure, no problem.
I would, however, go to the LBS and buy a handful of new spokes in the size of the busted one. I've gone to bike shops (not in the expensive SF-Bay area!) before with a broken spoke and asked for a handful of matching replacements (don't buy only one, they tend to be cheap) before and walked out with a bill of about $1. Truing a wheel with a missing spoke is a recipe for disaster.