I think I remember reading somewhere that the second CPU will be ignored. You could save yourself a bunch of money and get an Opteron-based motherboard. Especially since Xeons are quite slow (compared to their desktop counterparts, wheras the Opterons are right up there performance-wise). As for ban...
I think you should call up your supposed ISP and tell them to quit being a bunch of amateurs. Hotspot is fine for occasional use, but it was never intended to be used as a permanent, daily solution. See if this ISP will let you use PPPoE instead. An auto-login program that sits in the tray just seem...