I'm using a synology ds412+, which i love and was super easy to setup, and is super quiet... but you may have been referring to software if you want to stick with your old gateway hardware wise..?
I believe the Intel 7260HMW is the most popular 802.11ac choice, but you probably already figured that out... http://www.newegg.com/Product/Product.aspx?Item=N82E16833106190
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