A friend and I have recently started doing 70 arenas after 69 twinking was killed by the new battleground XP and such. Now were not the greatest arena players at 80 and average around 1600 at 80 with our mains. at 70 with a double mage team with northrend quest greens and blues we've gotten to 2k relatively easily.
See at the 70 bracket there seems to be a lot less talent and a lot fewer teams, therefore you face the same team more often, gain more points from wins, and lose barely any points from losses. We reached 2k in a week playing about an hour a day on our battlegroup(ruin) with queue times in the middle of the day being constant with an average wait time of 1-4 minutes.
Our plan was to get full brutal just for fun, but when i went to Area 52 to scout the gear I realized that you could purchase RELENTLESS glad gear and 1800 weapons with our 70 2's team rating. I now have the relentless glad staff, wand, and pants. I plan on getting full relentless (minus the shoulders because you need a 3's rating for them) and then leveling to 80.
I hope this helps people that have level 70 alts that they plan on leveling, getting gear for them even before they start leveling pretty easily
Good luck and have fun!!