Well if you're not that into bonus whoring then I fully recommend Pokerstars! In my experience it is far away the best place to play SSS at. It probably has more NL10, NL25 tables than party has in total, so there really are plenty fish in the sea!
Obviously the bonusses are nearly none existent (only $50 first deposit bonus, dunno about other bonusses tho) but the amount of fish make up for it.
Put it this way: I've made more money there in one week than I have at party for example. Yeah could be major upswing but I played at this rate for the past month.
Of course if you're more interested in bonusses you could try some of the "smaller" sites as they usually have better offers (they are desperate for players). Really tho they usually don't have that many tables at the micros (essential in SSS). I'm asuming you're still playing micros (forgive me if I'm mistaken ♦)
cheers