I highly recommend Bet365 of all the sportsbooks. I'm not sure how their current bonus offering compares to other books, but they are simply the world's #1 sportsbook.
They always have the longest odds (aside from Pinnacle, but Pinnacle has limited options), the most sports and betting options, same game parlays, multi-game parlay bonuses, early payouts, live cash out opportunities, bet boosts, and they give me free $10 bets at least twice per week (no strings) if not more often, and sometimes they give out loyalty credits too.
Also, they're publicly traded, so they will absolutely not f*** around with your money. If you want to withdraw it, it's yours. They also offer Interac e-deposits as a way to pay and withdraw.
No other book comes close to Bet365, imo.
Also, they should pay me for this.