I just got shipping confirmation for my size 9 Katahdin's. I went TTS. I hope it was not a mistake. I might go ahead and place an order for a 8.5 just to compare. Edit: I'm so impatient I just ordered 1/2 size down, 8.5D.
I think TTS is good, 1/2 size down if you don't plan on wearing thick socks. The boots are stiff at first, but with a couple weeks of wear they will loosen up and have more room. I love wearing mine right now, gotta get more boots!