I second Gallia. They're supposed to be something like the Empire out of Star Wars on a mission to conquer the universe, yet you only get to see them in proper numbers once or twice a week.
Moreover if you start winning a whole lot, nobody can bash you on the head and tell you you aren't supposed to win according to the pre-written lore, if you like to fly capital ships you can do so since Gallia is supposed to have endless numbers of battleships and cruisers. Their ships are good too, except for the Cruiser and maybe the Gunboat.
Plus with low activity there, a group the size you mention will have the ability to make an impact and shake things up a little, your credits and player count will translate into actual in-game influence more easily there, which might be good. Gallia is a Discovery addition as well, so you are pretty free to do your own thing without someone telling you that you are supposed to things a different way.