Another thing to look out for if you plan to use a rack is chainstay length. The Nova Race and Jake the Snake I mentioned both have 425mm chainstays, which works for me but might be a problem for people with big feet. Some racks offer a bit of relief in this regard.

You didn't mention your budget, but if it's high enough and you're willing to consider titanium, you could build something like this beauty:



(Image borrowed from the Retroshift Facebook page.)