The serbia / bosnia to adriatic route, I would probably come across serbia and cut down through sarajevo then mostar and to the coast. The road from mostar to the coast is really nice and both places worth a stop.
The romanian roads were not too bad when I went. It's quite easy to stay on decent tarmac most of the time. There were some rough patches, but the main roads through brasov / sibiu etc. areas were not too bad at all. The only bad patch I struck was along the danube (we came down danube on romanian side from near belgrade). Half the road was perfect new tarmac, the other half they were still building, so it was very rough. Nothing you couldn't survive though! I'm sure they have progressed since last year too!
Banja Luka in bosnia meant to be very nice too. So that is another option if you want to come further west through serbia, i've not been that way though.
Good luck.
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