Right now i consider a synergy of fleets best.
You need one player to go for BCs, just because they are that strong. Hiigarans are obviously the best candidate for this.
Then you need some early game, fighters, corvettes. Vaygr reign supreme. Did you know that a swarm of meager assault craft can shred a torp frig hyper rush with ease?
Lastly, a HW1 race, currently leaning to Taiidan. Support is the key. You have the cheap probes, the cheap scouts, defenders, repair corvs, salvage and of course, grav wells.
A mix of these 3 races should be ideal.
What do you think? Tell of your experiences with setups.