I have a Netgear R6400 AC1750 Dual-Band Wi-Fi Router that I bought from Best Buy 7 months ago. This router is 802.11ac-capable with gigabit Ethernet ports. I tried an ASUS AC3100, but after bricking two during the initial firmware upgrade and then having the tech support representative tell me to never use the latest firmware (???), I bought the Netgear. Couldn’t be happier! Signal strength is also better than the ASUS, and covers my whole house.
Technology changes very quickly in routers nowadays, but hardly anyone actually needs the latest-and-greatest. I’d normally target at least an 802.11n router, but you mentioned NAS, which makes it sound like you do large device-to-device file transfers. However, even an 802.11n router will exceed most home Internet connections many times over. Simultaneous 2.4 & 5GHz Dual Band WiFi and gigabit hard-wired ports are preferred IMO, but not normally required. In your case you may want the gigabit ports. FYI, Wyze cams operate on 2.4 GHz 802.11n, available in most any router.
Obviously, environments vary. As far as the environment my router operates in, I do large in-home device-to-device transfers, have gigabit Ethernet, several 802.11ac and 802.11n devices, and my Internet connection is 70Mbps down, 6Mbps up. Except for my large device-to-device transfers an 802.11n router would cover this fine. Only an 802.11g and below would be slower than my Internet (and I don’t think those are sold anymore).
As far as 802.11n routers, my sister didn’t need or want an AC router like I bought, so I bought her the much simpler but still fully-capable Netgear WNDR3400 N600 Dual-Band Wi-Fi Router. Compared to mine it was half the cost, 100Mbit wired, and no 802.11ac, but still far faster than either of our Internet connections.