Futurus Sanguis, 9 players, i'd say say of them aren't too active. Decent over all, can't really do more than take a few towns early on and will be preoccupied if they want to survive in general.
Knights Order, weak average, admittedly a few decent players on top. Probably will be your first real war. Overall if you guys at least know how to play the game and can play smart, then I don't see KO winning.
The Image, A player that we took three cities from in Gyth with no return conquest tops their member list. Now I bet that he's a lot better from that experience, but the point still stands. I don't think they'll have the fire power to take you guys down.
I can promise you that FBD will be too busy to care about you if they're smart. They have to worry about RA, TBC, LD, and you.