Its all pointless...
Even 802.11n is pointless, does your client support all the features your access point claims, multiple streams?, no, very unlikely if your using a phone or tablet or any other built in wireless. Speeds of 300mb @ 2.4 and 450 @ 5ghz, lies unless your client is physically built like the access point with multiple aerials etc. Check the speed you get on your phone or tablet, 65mbps or 72mbps at best. John.w said it best, wireless is about mobility not replacing a high speed cable. Wireless is about wandering into an area, browsing email, web, semi low bandwidth youtube videos.
2.4ghz is dead, 802.11n / channel bonding is unusable with it being everywhere. Client adapters need to embrace 5ghz and multiple streams faster. 5ghz allows the channels and throughput.
Dont forget that wireless is a shared medium, its still a HUB, with each additional client the speed is cut in half again for every client.