I've been mulling over this question myself. I've come to the following conclusion, based upon who we would be best allies with, and likewise who would be willing to ally with us:
Super Best Friends Tier (strong potential)
The Galactic Empire
Maybe Tier (moderate potential)
Covenant of the Black Rose?
Mandalorians?
Primeval?
Untermensch Tier (questionable/uncertain potential - probably a waste of time)
Techno Union
One Sith?
Profligate Tier (fire at will)
The Republic
Silver Sanctum
Galactic Alliance
In my opinion our first order of business should be establishing a relationship with the Galactic Empire. Yeah, I know - they're the "other" Imperial faction, who we're kind of competing with, but really. They should be our friends from an IC perspective. We're after the same goals, after all.
That brings us to the other Dark Side factions. Covenant is an interesting proposition, but that friendship would come at a price, possibly putting us on the One Sith's radar. Depends if we want to draw that kind of heat this early. Then again, a few of us are One Sith dropouts, which they don't exactly like very much, so the possibility of an alliance with them might be off the table anyway. And then there's the Primeval. I don't really know what they're about, so all I can say about them is... I don't know.