I found a Simple Log Cabin Plan that I like a lot!  It makes really good use of the large loft space, and it does not use up any of the square footage with stairs!  I also really like the covered front porch.  We can enjoy being outside even if it sprinkles a little rain.

Here is the website where the plan was found:

http://www.coolhouseplans.com/details.html?pid=41750