actually this is my first time to heard that three of sites you mention and i only know betonline.ag although i am not playing gambling in that all sites. if this is your first time to playing gambling, then i think you can search in gambling thread and you can found many safe sites although you can use the link that i am wearing  but i hope you are really careful when you decide to playing gambling because i think 0.1-0.5 btc is big money although maybe its not big for you.