My mistake, sorry. It was discs and racks as you said.
This is from the Karate Monkey description on the Surly site:
"One more thing: Surly does not recommend the use of racks and disc brakes at the same time on the Karate Monkey. A rack will not clear the disc caliper without jury-rigging the leg outboard, and this will put stress on the mount, potentially breaking it. If you take nothing else from reading this, remember: No rack and disc brakes simultaneously on this frame. Get it? Got it? Good."
Either way, I want both so the KM is out for me.
The Vaya and Troll are very interesting and I will pursue them. Maybe get a Pugsley another year. It would be nice just to have one!