I chose Velocity Dyads for my Surly Ogre after much reading on online forums.
I got good pricing from jensonusa.com.
I went with 36H and for me a dynamo hub was a no brainer for my usage, so I went with a Son28.
The newish SP dynamo hubs hadnt been around long enough to have any reputation, but they have now and if I was making a purchase decision now, SP would be high on the list.
Cant comment on the shimano hubs as I havnt had any since the early 90's.
I tend to prefer IGH due to a hopeful perception of less maintenance.
My previous wheels were built up by wheelbuilder.com and I had no problems with them.
I'm in Australia and I've had issues with local builders and wish I'd paid the extra to once again get wheelbuilder in California to do the build of my current hoops.
I'm sure the shipping would be much cheaper for those living in the States.
Oh and my primary use for my dynamo hub, unlike others, is keeping my cell phone and gps charged.
I dont ride much at night when touring, but do when I'm home as daytime in the summer is mostly too hot to ride where I am.

Best of luck with what ever you go with

Happy Spinning