Hello, this is, probably, a very stupid airport question that I think I already know the answer to. I've got a first gen airport express (did they ever update them?) running my MBP and my girlfriend's iBook. I've been wanting to upgrade to an airport extreme with the wireless N. Now, because she's still running on G, does that mean that i will notice ZERO difference in speed? Also, can I use the airport extreme as wireless N, and send that signal to the airport express which is giving a G to her?I guess, with wireless N is it all or nothing? Does every item running on it (two computers, a Wii and an x360) have to all be N and otherwise the effects are nil? Also, can i use the airport extreme as a router? Can I hook the cable from the modem into the extreme, then run a cable out of that straight into the 360? make sense? have i gone mad? Thanks in advance!