Both
Legendz & their sister book
ThePig currently have no complaints levied against them at this time. Not to mention that both books have very good customer service.
Both of these books will start you out with low limits ($500 online limits including prop bets) and they won't raise your limit until at least 30 days. At that point you have to request it through a manager and have it approved (Keep in mind that they are a recreational book and could cut your limits at some point).
ThePig will use -108 opposed to
Legendz who uses a .20 cent line for baseball and no overnight lines. Not to mention they offer a 10% signup bonus for U.S. players, but if you sign up on either a Tues or Wed. you will recieve an extra 5% (cash bonus/5x's rollover)
The area I feel both of these two books need to improve on is their payment solutions for both depositing for U.S. player. Currently they only offer Western Union, Moneygram, and Cashier checks. (The do take Moneybookers & Neteller for those who can use it, not to mention higher bonus offerings with a 7x rollover). However, both books process their payouts very promptly that offer 1 free check every calender month (flat $55 fee after that/takes 3-4 days fedex to get it).