I need a company who will maintenance my servers in Theplanet.com (Cpanel,patch, upgrade and all security problem). With this option, I can concentrate to sell hosting only!
Where I find the companies who offers like this?

Contact Rob or Ronny from http://www.acunett.com/management . They do great work. Say Hi for me while you are there.

I found another company :
http://www.fastservermanagement.com/

Thank you..thank you
another companies ....please..

http://www.wemanageservers.com/

have you tried them, I haven't heard very many good things from them.

who already hire them? who the best choice?

A number of us have used acunett.com and are pleased with them. Their prices is very platable and their service is exceptional. I actually started out with their one-off deal and was so impressed that I signed up with their monthly plan. Recently I had to give them up not because they were bad but because I no longer needed a Linux based server. Sad thing to have to let them go but business is business and they are very understanding about it.