I'd just plug in the N router into the cable modem, and add a 2nd network. Use the existing one as a guest network, and the N for things that need the better range and speed.
my case shipped yesterday, fedex ground, so it'll be a while.
Keyboard works fine, tho mostly I don't need it. I am ordering a logitech dinovo mini to replace the bt keyboard I just stole from my mac, tho