Tom,
I have a 45NX and am very happy with it. Prices have come down on used cameras, and you can find a used 45NX in the $300-$400 range. It is perfectly suited for your needs, short hikes and architecture. Accessories, both new and used, are less expensive for the Cambo/Calumet cameras than for Arca Swiss or Sinar. If you want to spend more for a new camera, the Arca Swiss Discovery is very nice.
Originally, I intended to buy a Discovery, but found a nice deal on a used 45NX. I bought it and am happy with it. I wrote a detailed review of the 45NX for the Large Format Home Page. It might be worth checking out. My recommendation is to buy a 45NX instead of the 45N. You get some nice features with the more expensive camera, particularly the revolving back. If you buy a used 45NX, you can put more money into your lenses, which is really where it is at.
I have also bought from Midwest Photo Exchange, and they are very good. Ask for Jim. If you live near a Calumet store, check them out. Sometimes they have good deals on used 45NXs. I have not bought from Badger Graphics, but they have an excellent reputation, as does the F Stops Here.
Best of luck.
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