My understanding is that Bookmaker is Cris with a new site for US players. DSI I thought was a different company (or at least different management) that was backed by Cris and used Cris' lines and platform.
DSI has higher limits apparently...NFL 20K/NCAA 10K...Dimelines on MLB after 10:30am ET the day of the game...
Not bad....too bad my betpoints from bookmaker cannot be transfered