If you're in Boston and looking for 27" fixie wheels, there's a guy in Framingham that does it (referenced earlier in the thread). Check out Craigslist - he posts weekly. His wheels are cheap as balls and have generally gotten good reviews. He'd probably even help you convert, if you wanted.

You should be fine switching to 700 too, if you want, which is what I did with an old Trek 400 frame. If you get some toe overlap, you just learn to deal - I've got a good 2 inches, and I just think about how I corner. Don't even notice it anymore.

As far as the frame goes, there's a lot of frame snobbery around. Who cares what kind of steel your first fixie is! Get out and ride.