I want to upgrade wifi network, and considering new Airport Extreme. Will run 2 MacBooks, G4 Powerbook and 2 PCs, as well as iPhone, PSP, etc. Currently use Netgear Rangemax DG834PN Modem/Router. Should I use the Netgear box as DSL modem for Airport Extreme (it is 802.11 b/g), or get a new modem? Any suggestions / recommendations?