there is nothing wrong in sticking with 27" wheels. Considering the number of older bikes out there, its a pretty big stretch to say they will be useless or have no resale value should they outlive your current frame.

I put a used set of 27" touring wheels on my old campus bike. They were supper stout, a perfect match for the frame, and both cheaper and stronger than if i had sprung for a new set of 700's. Harris cyclery has some of the few options out there for new, but if you hunt around on ebay you can get a nice set for a steal.

If you have the scroll and plan on doing a lot of miles or city riding on rough streets, then spring for the sun rims. I'd be leery of the single wall rims, only get them if you are broke and don't plan on ridding a lot since they will certainly be less durable..