My home currently has a Time Capsule in the basement connected to my cable modem. I also have an Airport Express on the 2nd level to extend the wireless network. In a few months I will be finished with my home office on the main level. I was planning on getting a second Airport Express as I like to have strong wireless throughout the house and this would have me covered on each level. Now with the new products I'm wondering if I'd be better off getting the new Airport Extreme. I don't know if I would need the added features of the simultaneous broadcasting and guest network but they do sound nice to have just in case I want them. Basically I have it set up now with my Time Capsule broadcasting in B/G/N mode and my Airport Express in N only but 2.4 Ghz. If I did get the new AEBS I would probably have it as N only 5 Ghz and extend the B/G/N network. My MBA on the main level usually connects to the Time Capsule network as it gets better reception but not perfect. Do you guys think this makes sense or is it overkill and I should just get an AEX for the main level and use it in N only mode 2.4 Ghz? I guess the main question is how much of an improvement would I see with the computer in the office on N 5.0 Ghz vs. N 2.4 Ghz. Also I want to make sure that the new AEBS would be able to use the new functionality even if it is getting the internet from an older Time Capsule. Thanks.