Party Poker, Pokerstars, and FullTilt are the main choices for the poker professionals. These sites have the biggest games around, which is what the poker professionals are looking for. Ultimate Bet seems to attract some high stakes players, as they offer big no limit games, but Ultimate Bet got a black mark in 2003 for some shady marketing involving the poker professionals on their site. I won’t get into it here, but it caused some big names to leave the site.