Hi Grant:
Jane, my long suffering wife, and I rode from Barcelona, via Montserrat, to Logroño and then on to Leon. Our destination was Santiago, but Jane had a bad crash in Leon and we ended up walking around Europe for the next five months. She could walk okay, but her badly injured knee couldn't manage the bicycle.
Jane kept a very great blog on our adventures, you can see it at:
http://womanonherway.com/2013/05/page/2/
Montserrat was fantastic, really worth seeing. We did the Zaragoza route and it wasn't that much fun. It was mostly busy highways, with heavy truck traffic and a constant headwind, called Cierzo. You can see her discussion of that at:
http://womanonherway.com/2013/05/17/may-16-and-17-zaragoza/
We fought the wind the entire route, and it was severe at times. At one point we were riding downhill, in first gear, peddling, just to keep moving. We were doing the ride in May, perhaps it subsides during other times?
I have a suspicion that the Huesca route might be more inviting. The route we took involved lots of limited access highways and fast moving traffic. We were riding touring machines, with saddle bags, front and rear. I concluded that, if I were to do it again, I would use a mountain bike. There is so much cobblestone and plenty of dirt roads; the mountain bike is more suitable for those situations. I would do the ride again, but would be tempted to try the Huesca route.
Jane is currently working on a book about our adventures.
Keep us posted on what you decide. If you keep a blog, please point us to it.
Dennis and Jane
http://womanonherway.com/