Grats on 80! AV is really fun. As far as the ghost, what might have happened is you all got killed, but one of your guys missed the spirit rez timer and started following as a ghost when all the rest of your guys were rezzed. I know that happens to me quit often.

You should hit Wintergrasp every time it's up. You can get some REALLY nice gear, 2 trinkets, chest, feet, helm, belt. Also, you can get some nice pvp gear with honor now, you should be greard in now time. Also a lot of the PVP gear has hit options, so you could use it for pve as well.