As you read http://en.wikipedia.org/wiki/List_of_WLAN_channels you notice that 802.11n 40MHz OFDM gave you one non-overlapping channel. So this is why many pull back to one or two steps back when they "use a router as a WAP." (google that!)
http://forums.cnet.com/7723-7585_102-602528/how-to-create-a-wireless-network-for-a-large-house/?tag=contentBody;threadListing is a fine discussion and worth reading.
I'm just looking to increase the bandwidth in my home. I have a wireless router that's handling a desktop, a laptop, and two Xbox's and it holds up pretty well when only two of the devices are running at the same time. So, I'm looking to increase the bandwidth some so I can eliminate lag while I'm on my Xbox, my brother is on his Xbox and my mom is on her desktop. I'm not really looking to buy a $500 router for everyone to use, so I was wondering if a switch or a second wireless router would suffice? Thanks in advance. I'm not an expert at home networking so I thought I'd come here where people are more knowledgeable in this field than I am.