Carl,
I think your making a prudent choice. As I mentioned I love my sander.....but......I do a lot of other woodworking and the planer is invaluable in my shop. For instance if I'm making Adirondack chairs and have to mill many slats to thickness I would go bonkers if I had to do it with my Performax. It would take me waaaaaay too long. But as mentioned, for guitar building I, like the others, would strongly recommend a wide belt or drum sander. It will propel your work immeasurably. Enjoy your planer.
Gil
PS As long as your set on a planer the only thing I'd suggest is spending a bit more and going to a 220v 15". Just my .02.