I'd recommend taking a looking at The Wirecutter's guide here: http://thewirecutter.com/reviews/best-wi-fi-router/

I'd quite highly recommend the Archer C8 if you are okay with the fact that it doesn't support HFS or ExFAT on external drives: http://smile.amazon.com/TP-LINK-Archer-C8-Wireless-1350Mbps/...