ACR , Bwin , Pokerstars the main poker rooms that I play , I also play on 888poker , partypoker , wanna try playing on sportsbetting and betonline and see how it goes , also I will see with unibet what's going on , it used not to allow greek players , not I see on unibet.gr I can register , I'll see how it goes
I also play rarely on a bitcoin site , wanna try more in the future.
You have to play in more that one poker rooms , seek for the edges , the promotions , some extra chances to win money , the leaderboards , good series of games , nice pool of players in the games you like , etc