My plan was to do just that, including the BB height. It seems that what is critical for a good fit is that central "triangle" between the top tube, downtube and seat tube, so if I can get something pretty close to my road bike (and my handlebars are just a scrunch above my seat, so I'm not in a real aggressive riding position), I should be able to dial it in just as well.

Running down all the suggestions folks have made here has helped me clarify what I'm looking for besides the dimensions of that triangle, which pretty much boils down to the ability to put slightly larger tires on it. That Ribble frame that tsl recommended, while clearly a good price point, can only handle 23mm tires (I run 25's on my road bike!), and I'd like to have the option of going as heavy as 28-32 AND be able to mount fenders.

If the Surly's (e.g. the Pacer or Cross Check) have measurements that work they look to be a good choice - I need to compare the geometry to my current bike. My LBS is a Surly dealer and might be able to offer some purchase advice on one of those.