One thing that may have been said already, I didn't see it though, is that you can get the pvp lvl 70 BLUE gear from rep vendors in outland/caverns of time if you have honoured rep with them, this may solve some of the gear issues you have and might make your chars a bit tougher too, although I am basing this purely on you saying you have green gear at 70.

these are the vendors:

http://www.wowhead.com/?npc=21432

http://www.wowhead.com/?npc=21655

http://www.wowhead.com/?npc=17585

http://www.wowhead.com/?npc=21643

http://www.wowhead.com/?npc=17904