Hi,
i stop to give info about Bet24, i know few people who have withdrawal problem
with Bet & Win, the only problem you go to have is they sometimes avoid the bet and if you begin to win they limit you quickly (its depend for who), and their odds go down quickly (but no problem for to withdraw). First time i dont like them but there is full of choice and sometimes they do few mistakes. (i dont know betoto but i think they are exactly the same..but greek)
After for the cycling, the books i use is: Bet and Win, Expekt (scandinavian), Unibet (scandinavian), and sometimes on Pinnacle.
there is a good american forum, few are professionnal in the arbitrage, so you can talk Bookies with them, you go to have full of good info.
http://www.arbforum.co.uk/cgi-bin/yabb2/YaBB.pl
here you will have any principal info:
http://www.surebetbookies.com/bookmakers.html
hope i answer to your questions....
Cheers