Hi everyone, I'll likely be switching to Apple this Black Friday and intend to also get a new WIFI router with 802.11N to go along with the new iMac. However, in my research I read that if you're using a 802.11N WIFI router with 802.11N and 802.11G computers that mixing the two can slow down the whole network. 1) Is that true? 2) And, is that the case with the Airport Express and Extreme? (I searched the forum before posting this question and in a thread unrelated to this specific question, there was a poster who said that because the Extreme has simultaneous dual band, it can dedicate one band to N and one to G. I know little about this stuff but I thought dual band merely means the 2.4GHz and 5Ghz signals--and not about transmitting 802.11N and G simultaneously.) Thank you for any help.