I've not done 80 pvp yet, but at 70...

Basically did the minimum number of AB, Eye and WSG for enough badges to get gear. And did as many AV's as possible. In my battlegroup, AV is roughly 50/50 so its the most fun too as either side can win any given BG.

Pick whichever is the most honor per hour, or if you have a favorite BG run that one. The others are just for marks and to provide something different if you need a change of pace now and then.