Declan - It depends at what levels you play, for how long and wether you want to play seriously. If you want to progress then only Pokerstars and Full Tilt have the liquidity to get cash games or Tourneys all the time at higher stakes. If you want to keep it small stakes then any well known site ie Ladbrokes, Party, William hill, Betfair etc PKR is good for a different feel and look but serious online players almost all play Pokerstars and Full Tilt. Get rakeback too