quick question, how would wireless not fit your needs?
same building, you can have like 2 computers wired to the router
the rest wireless, no need to put wires behind the wall(thats even more trouble)
ARE ALL THE COMPUTERS IN THE SAME ROOM?
if it is, i don't see how wireless is not good for ya
if not, then go with what locki433 sed
well you can use cat5 or cat5e, i think cat6 is just overboard lol
go with cat5e