We feed our dwarves Harry too supplemented with our own small seed mix.
There is a german company which produces a dwarf mix which we have tried. We have tried it personally. I know many people do like this food however we find our do just as well on Harry and Bunny is very expensive and has to be mail ordered. It is a personal choice what you feed and some people like one food and some others.
Here is a link to the Bunny Dwarf food
http://www.zooplus.com/shop/rodents/foo ... ood/107360