I'm looking at the Yuba Mundo with 2 Bobike Junior seats to carry my 4 and 6 year old children. 

First, does anybody know if those seats will mount on a Mundo? 

Second, I'm open to all other recommendations, but would like to keep the cost under $2k, so I think that rules out the WorkCycles Fr8 and any bakfiets. (I've got a Mundo dealer here in Chicago but would consider having a bike shipped).

thanks!