So how much are you offering the guy? Funny thing about frames is that the value varies so much. There are so many old 80's frames that are practically free now, but that one is of course more unique. I just payed $300 myself for an old 80's track frame. Could have gotten a Soma or Spicer or something for the same amount, but for some reason this one was more attractive to me. Older stuff has more style sometimes. Anyways, if you are in the neighborhood of $400 I would go for this:
Seems to be your size, and since it uses 700c wheels you don't have to find a 26 inch rim to build up. You are paying mostly just for the exclusivity of having a 3Rensho, but hey they are cool..
-Jason