the only thing with betjam for cbb is they don't post overnights. you lose a lot of value not being able to bet the openers. i would have to say bookmaker and thegreek are a must for cbb. also check out carib. can catch some offlines and post overnight lines. good bonus program too.
very good point about early lines.betjam is fast and bookmakers fees are a little much but those early lines are a must.good to have a few books ,matchbook is a must for line shopping.,
I have used bookmaker dsi for years,fantastic book,great betpoints program,earliest lines out there usually.
If you go with bookmaker/dsi,write canada mike at mikel @ 2betdsi.com and get him to handle your account.he will probably hook you up with a great sign up bonus and he always gets me 40% bonus on every reload.
betphoenix has a really good 5 cent line.
just be careful and go with a good book with a solid rating