What level is your team now, and how long do you plan to level in the BG's?
Also, what level of frustration is acceptable?

If you have less gear than the playing field, you're going to die a lot.
Which of course is less fun than killing hordies and winning.
If you're at maximum level, honor comes over time and that gets you better gear which fairly quickly makes your a force.

Depends on your resources too.
Dropping 25-30k hasn't been a big deal for me, to buy the level 85 crafted starter pvp set.
Have done that for the Ferals and the DK team (4x DK, 1x Pally are 84th now).
For me, even though the gear will be replaced completely in 7-10 days of too many hours per day... I'd rather have the ability to sort of contribute immediately and to not automatically be stomped by a geared single player or two.

If your team is in the 60-64 bracket, I'd do Hellfire and maybe a bit of Zangarmarsh.
Rather than buy on the AH.
There are enough quests, you can avoid most of the collections.
And AV/BG to 64th, to be able to pick and choose Terrokar/Nagrand/Blade'sEdge quests and then run the 65-69 bracket, as a group of 66's or 67's.