If you guys did get organized enough to get 15 together, I would recommend AB. The alliance are not putting up much of a fight in AB these days and with some practice using vent you could get the 3 node or 5 node strats down. AB is all about team work and good movement more than gear. If you had a 15 man team you could 4 and 5 node most games. DO and Super Winners are the only occational teams right now and they are normally wsg teams waiting for that queue. 

Amalo