Before getting too caught up in buying new equipment, go to http://www.totusoft.com and download LAN Speed Test and LST Server. Install LST Server on a desktop and LAN Speed Test on your laptop. Run a couple tests around the house and tell me what kind of speeds you are seeing via wireless.... Also, are you seeing any problems currently or are you just looking to optimize it as best as you can?
Sharing channel 11 with one SSID is not bad at all, it probably is not hurting your throughput much. 5GHz will have lesser range and weaker penetration through walls, so a lot of times you may see no one. Couple that with a lot of routers that are only 2.4GHz and you have some nice open air there. Some cordless phones do transmit on 5GHz though and be aware it may not have as much range around your house.
Let's get some speed tests first though and see what kind of throughput we are looking at and we'll go from there.
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