Similar situation to me then. 
I've got a 1900ac running gargoyle as the main router downstairs, and a wndr3800 connected by Ethernet upstairs purely as wifi (wan disabled). 
Gives plenty of coverage.
			
			
									
									Best Router for Gargoyle
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Re: Best Router for Gargoyle
 https://lantisproject.com/downloads/gargoylebuilds for the latest releases
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https://lantisproject.com/blog
						Please be respectful when posting. I do this in my free time on a volunteer basis.
https://lantisproject.com/blog