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I dont recommend sportsbook, how can you tell that is the best poker site1!@!@!
Sportsbook is site with problems, resulting in slow payouts(if any).
Fulltilt and pokerstars are the best poker sites, noone can beat them.
They offer security and great gameplay with millions of other poker players.
Sportsbook sucks all around. Unless you never plan on cashing out. Then go for it! But you can check reviews of US friendly sites at http://poker-lobby.com and http://dagus-statistics.com/reviews
If you are only investing in one site for now, I'd recommend Poker Stars or Full Tilt. They are the two largest sites for a reason, they have lots of games with lots of competition at all stakes. They only take a few days to pay out unlike sportsbook, who prefers to keep their customers' money even if they request a cashout.