Best Router: Asus RT-N66U VS D Link Dir 857

i currently have a d link so thats what im leaning towards as i use NAS and with the d link i know how shareport works and know the transfer to the d link router will be easier. i have 4 main things im worried about 1)wifi signal (though i will not be wifi only other users will, i want them to get the most of our 100mbps down) i believe the asus wins this one 2)help against ddos attacks ( i know ill never be able to completely stop them, but the more bandwidth and the stronger my router is, the better chance they will fail) i think the d link is better cause twice the ram of the asus and probably a stronger cpu 3)usb speed for my NAS, i believe the d link will win in this category 4)reliability and compatibility, no one wants something that doesnt do what it is suppose to im leaning towards the d link cause i found one for 80+13 shipping on ebay, but starting to want the asus as the downlink throughput over wifi looks superior, any input appreciated thanks