Breitenbush is, indeed, gorgeous, and the hot springs are a definite plus (but kind of hard on your guitar).
But Breitenbush is very popular and thus both hard and spendy to book.

The trouble with some places like Eugene is that they don't have good air travel access.   I'd vote for a place like Seattle, Portland, Sacramento, San Jose, Reno, etc., that is easy to get to by car, train, or plane.   If we expect to draw 'catters from a wide area, that is.

Of course, maybe we could all crash our own Barbara's folkie gathering in Sheridan, OR (not too far from Salem) on the third weekend in July. ;)