I think your friend is going to set up a server, Its a great idea, I personally think the best choice for your friend is to go for cpanel latest version which is going to be released by 29 of this month. Most of our clients demand cpanel. Now the cpanel 11 has been released and we provide them with that version, This will suite both if he uses the server of sells it to anyone, for master reselling !
My point ask your friend to go for cpanel11, All the best !