Play at most sites but trying to narrow it down to these main three.
ACR more realistic tournament structure,all day freerolls to venom steps and twitch/radio freerolls and has proven the most trustworthy in my experience.
partypoker Solid promotions that always give the punter something in their hand ,excellent range of tourney buy-ins and structured well.
Natural8 My fav of the newer sites,automated staking is unbeatable and plenty of other new and some subtle things you dont find anywhere else,like automatic bubble insurance where buy=ins to most regular type tournaments are refunded for the two bubble positions if you reg before start time
.Also had my fastest cash and carry there within a couple of days of making minimum deposit,no problem.
as for pokerstars i nearly uninstalled forever a long time ago...now i have ...when they got sold years ago it got turned into a low down filthy thieving scam,totally unbelievable the tricks ive seen being pulled there,and im doing better now that ive got rid of them,i dont trust stars in the slightest,almost impossible to get a trouble free run there,good riddens lol.