Which Router?

[Stereo99]

Hi: I'm going to replace my D-link DIR-655 very soon as with now using the following devices: PC,PS3(streaming from netflix),Ipad 3, Laptop, sometimes 2 or more of these items it seems really is no longer able to do the job(If I'm using say my CPU(On youtube) and have a person using anything else listed above the youtube video's really lag to the point I go off the net,conversely if I'm the only person using the network it runs just fine. Will be upgrading the network card using a D-link DWA-552 (I think that is the model number?)Here are what has been recommended so far what do you think? Thanks for the help!!

Netgear Dual-Band Wireless AC Gigabit Router (R6300)

Asus Wireless N Router (RT-N66U)

ASUS Dual-Band Wireless Gigabit Router (RT-AC66U)