1.  Bodog:

The world's largest online sportsbook, became larger by carefully balancing all that is needed in order to run a top notch operation. This includes offering fast payouts, consistently solid odds, great customer service from a well trained staff, and a rewarding loyalty program.  If you ever need customer assistance the friendly staff is trained to answer you call on the first ring, all emails are responded to within 15 minutes.

2.  Bet US:

For over 13 years they have been delivering the on-field excitement of NFL Football and NBA Basketball betting straight to your home. Join now, and you’ll receive up to 145% in bonuses, a free BetUS swimsuit calendar & "Making of" DVD, free sports picks, a personal account manager, unmatched promotions, free sports magazines, the BetUS Rewards program, and our easy to use sportsbook and online gambling interface!

 3.  Book Maker:

Since 1996, BookMaker has been building a reputation among sports betting enthusiasts for outstanding first-class customer service. BookMaker offers safe, secure and legal sports betting on sporting events, as well as horse racing and online casino games from any location in the world by telephone, internet, or hundreds of other wireless devices 24 hours a day 7 days a week 365 days a year..

Based in Costa Rica, Diamond is one of the most reputable and well established sports books in the world. They offer fair odds, highly generous comp programs, a well respected brand, and responsive and friendly customer service. They have a geneous sign up bonus for all new players.