My 2cents worth:
Can't say enough about these:
http://www.amazon.com/dp/B0079KAVN0/?tag=casaivar02-20
Just an incredible shoe for the camino.
Great tread for traction, lightweight, laces you can tighten with your heel tamped down for walking down mountains. I love love love them.
I showed up like an idiot in my 10 year old Danner boots; the sharp rock roads of the Pyrenees took all the remaining tread off. Rather than sliding down hills and breaking my limbs the rest of the camino, I bought a pair of Merrells in Pamplona, (gave my old Danners a respectful, tearful burial in the bushes outside the city).
Contrary to what they say about not breaking in shoes on the camino, my story ended beautifully thanks to a well-built superb Merrell shoe, well fitted, (one size bigger), and two pair of socks (preferably thin silk next to the skin).
I had no, I repeat, no blisters. Not a one. Danced the light fandango the rest of the way.
Tread is a HUGE issue for safety on tricky terrain, uphill and down, and your Blundboots don't look like they have good waffle tread to me...
Whatever you choose, have an absolutely fabulous walk my friend!