I have tried and using [ Monoprice 12-port USB 2.0 Hub w/3.5A AC Adapter ] in my setup I'm running 7 block erupters on it nicely and due to the nice round shape there is plenty of breathing room between all of the erupters for heat dissipation.
Monoprice 12-port USB 2.0 Hub w/3.5A AC Adapter
Monoprice 12-port USB 2.0 Hub w/3.5A AC Adapter
what would be cool would be if these had fold out male connecters in the bottom so that you could stack them.
He he, just found one that can be stacked!
http://www.amazon.co.uk/Revoltec-7-Port-USB2-0-Stackable-RZ055/dp/B002NQSE4I
http://www.ceneo.pl/7395777
Alas, as I see it, it's port layout will allow only for 3 BEs to be connected. Also, I cannot find the power adapter specs anywhere. So it will not be added to the main table.