Need recommendation for Hi-Power Wireless router with Guest Network

I am trying to find a single high power wireless N router that preferably has a Guest network feature.  My client has a very large home, and there is simply no way to centralize the location of the main wireless router he currently has.  He currently has a range extender type of device for the far side of his house, but that creates a second wireless network and for some reason, it needs to be rebooted and/or reconfigured at least once a week because it just stops working.  I was reading about some high powered wireless routers on Amazon and other such places, but none of them seemed to have the guest network feature.  Is the guest network feature a rare thing among routers?  His main Netgear N router almost reaches to the far end of the house, but the signal strength is very low and un-reliable on the far side of the house.

Thanks for any advice.
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jbobstAsked:
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profgeekCommented:
The guest network feature is fairly common, but I'm not sure one router will work well in a large house.  The issue is not with the power of the router, but the properties of 802.11 and obstacles/interference that are present in a house, mainly lots of walls.  I just did an installation on a 6,000 square foot house with 3 floors.  I used three identical routers and set one up as the main router and the other two as wireless access points.  Each has a guest network built in, so guests can freely log in with their devices without accessing the household network.  Here are the routers I used:

http://www.amazon.com/gp/product/B004N625AA/ref=oh_o05_s00_i00_details

These are dual-band routers (they run 802.11n on a 5ghz radio, separate from the b/g, so you can combine both into one infrastructure at the same time).  We haven't had any issues with connectivity with these in the 6 months since I installed them, placing one on each floor, each on a non overlapping channel, and using the same ssid.  The devices will just pick the strongest signal and connect.
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