I have an iMac that is draft n capable and an older Mac Mini (1.66 Core Duo) that is only wireless G. I am currently using a Linksys wireless G router. I am looking at getting a Time Capsule to back up both of these units. What is the easiest (and cheapest) way to connect the Mac Mini to the Time Capsule via wireless N? Separate usb adapter? Airport Express Base Station? Can it even be done? Thanks in advance for any advice.