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 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.
ThePig will use -108 opposed to
Legendz who uses a .10 cent line (.20 cent line for baseball and no overnight lines).
The area I feel both of these 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 (3-4 days fedex with a flat $50 fee).
If I remember correctly the bonus structure was just recently changed not to long ago for both book. I really can't remember offhand what exactly was switched, however I do recall that something about you can't receive bonuses from both ThePig and Legendz at the same time.