Choosing a router (yes, again) - which one is right for the task?

Question

network hardware

Hello!
Initial data

• Network: RTK (St. Petersburg), DOCSIS (via ARRIS CM820, and from it via ethernet), in fact, a maximum of about 40 Mb / s, we eat little traffic.
  
• Clients: 4 laptops, dozens of smart phones/tablets of different brands (mainly ipads, the simplest is lumia 520).
  
• Load: two laptops are occupied by WoW (xs what do they need, jitter?), one laptop is for torrents and YouTube, one is a development laptop (a lot of ssh), tablets are busy with vkontakte / youtube.
  
• The network is home (not commercial, not an office), making holes in the walls is prohibited by the contract (it will not work to pick up laptops via cable)
  

Of the problems, there is one big one - the current ZYXEL P660HTW2 categorically cannot cope with the number of clients (tablets and laptops with Windows often and randomly lose their network) and with the load (the average CPU load during the day is around ~ 60%). Therefore I search for something more adequate to the task. Basically, you just need a router. Which routes. Everything (-:
Necessary

• Keep the network stable for the entire fleet of clients and a lot of small traffic (WoW, DHT, a bunch of ssh)
  
• Break through a two-meter wall (in principle, the power of the current zyxel is also enough)
  
• Simultaneous dual band operation (2.4/5 GHz)
  
• The ability to manually control the minimum / maximum band per client (so that everyone has just the Internet if some radish tried to occupy the entire channel)
  
• Do not change the router when switching to PPTP/PON
  

Not required but preferred

• 802.11n
  
• Connecting a NAS for Time Machine (by the way, which one would you recommend?)
  
• VPN?
  

The complexity of the setup is average, I don’t understand routers well, I’m not afraid of consoles (but I don’t burn with desire), I don’t want to sew (guarantee, all that).
Thank you!

Answer 1

If there are fixed workstations for laptops, then it is better to connect them with wires. In the end, security and all that.
Absolutely any router can work with NAS, they are also connected via Ethernet.

Answer 2

not even the most awesome wifi router can replace a puncher and a tangle of wires !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
now to your wall drilling problems. I recently made a network in a Soviet school building. ceiling thickness approx. 80 cm reinforced concrete. drill diameter 25 mm. along the way we met 5 rods, cm thick. The perforator is light. the drill itself weighed 1.7 times more than the puncher that hammered it in (there was no other at hand). dalbezhka was at the level of the head. in three hours!!!! I made a hole through the wall. although I confess a couple of times lost heart)))). try to be in my shoes once and then don’t complain when you need to drive a 5 mm drill through the wall.
Now let's go back to your router again. the router in the office was created only for accessing the Internet for mobile devices !!!!!! if you, as an administrator, decide to deploy an internal network through it .... it's your fault and you need to be punished.

Answer 3

average CPU load during the day around ~ 60%

40% of the time the processor is idle. I would not say that he can not cope with the load.