I've got 2 100 mbps feeds (1 dedicated for ghosting), anywhere between 2 and 5 computers yes all are capable of running 100 mbps. As for the switch, where's the fun in that? That's another part of it too. We want to recycle some old parts and reduce the amount of clutter in here to gain functionality. As for the leads, I can't disclose where they come from... has to do with where I work. Sorry.