I know this isn't your question but I'd suggest splitting your money up into different books.
1) you can get different outs/lines and select the best
2) there is less risk with your money in different places (like a diversified portfolio....if one books goes busto you aren't busto)
3) probably better to not have one $20k shot of money going into one place......for many reasons.
4) I'd suggest some of the rx sponsored books. Rx doesn't insure the money but Wil will try his hardest to make sure you are 100% satisfied......as suggested, Betjm, 5dimes, and Matchbook are solid.....i'd also look at BetPhoenix and Legendz