Most "powerful" house (within RP)

[Magoo!]

Hum. Liberty is, technically. In the Campaign it's said that the Liberty dreadnought is the strongest, most technologically advanced battleship in Sirius. It stands to reason that the rest of their ships, if inferior in design by nature, are at least up to par or better than those of the other Houses. Not to mention having a strong enough bureaucracy and enough cash to pull anything off in the case that they need to show that they're the most powerful.

I'd say Gallia could maybe take on two Houses, but anything more and the civil war, along with insurgency, would castrate them.

-Edit- Gallia might be the, in fact, most technologically advanced, but the civil war diminishes their power significantly. Hence why I say nay to them.