Catrin,

We must be the same size. You are exactly where I was about 9 months ago. I had my eye on a Salsa Casseroll but when I went to order it at the LBS found out that it was too big AND my current road bike that I had been riding for 5 years was also too big. Thus the beginning of my search and the reason I have a custom Luna being painted right now to replace my road bike. I am still looking for a commuter/trail bike and without going custom on it as well, I only found two in my price range that were small enough and only one that was steel.

Check out Gary Fisher cyclecross bikes (they are all steel with an ETT of 50.9) and the Specialized cyclecross bikes (they have a 50 TT).

PM me and I can share further. I feel your pain!