Best Online Poker tournament series for USA players?

Hi all,

I see Carbon poker has their Carbon OPS coming up in September, a month of bigger guaranteed tournaments.

What other sites for USA players have a regular tournament series like this, with bigger tournaments?

Which are the best to play, in your opinion?

Thanks

Besides carbons tourneys I would say bovada and it's smpo they also running 29 special Labor Day tourneys , acr/bcp in dec has 1 mil guranteed tourney as well I keep hearing that full flush is getting some big
Tourneys as well