If it were me I would go for the epic flyers but you don't just have to make one choice. Do dailies (preferably wintergrasp and/or bgs first) then do the others. Doing the wintergrasp will get you a couple of epics with the marks. Then you should be able to build up enough honor to get one more piece of gear fairly easy. At least then when you get your fliers you should have 3 to 4 epics which will help.