Johnny,
I too would like to see more of Bosnia, Serbia and Montenegro. Although the roads can't really be described as "good biking roads", since they're relatively straight and flat, the experience itself makes it worthwhile - the people and scenery.
During the trip, we both vowed never to go to Hungary again. We'd both been previously and found it dull and uninteresting, this time the same, but with added hassle. There are much better roads, people, driving standards, scenery, food etc. etc. in all of the neighbouring countries (in my opinion anyway).