My previous experience with Linksys was nothing but positive, so I'd recommend that even if the features look to fall behind other consumer devices.
TPLink was a disaster. I had nothing but problems with dropped connection and VoIP, until at one point the device failed and my warranty was denied by Microspot (the manufacturer says 3 years, but you only get 1 year from Microspot).
Now with the Asus RT-AC68U it's only been online for 3 weeks but since then not a single dropped connection or a required reboot. I hope it stays this way.
For a short moment I had a Netgear WNR3500 and also didn't have any problems with it, but the performance and range was rather poor comparing to the current Asus.
BTW the Ubiquiti Unifi looks great, but be aware it's not a Router, just an access point. You'd still need a router to manage the network.
This thread ties in nicely with my existing ethernet discussion . I plan to have my existing Swisscom internet box in the basement, which will be my main router and will handle Wifi on that floor. What I need is a reasonably good router to act as an access point and handle Wifi on the ground floor, and then have a repeater on the upstairs landing for the wifi upstairs. Therefore I don't need a huge wireless range, but need reliability, plus the capability to possibly handle 10Gbit speeds in the future.
This is more-or-less exactly my setup. I use the Orange box as a router (I assume your Swisscom box can be used as a router as well?). No need to buy additional routers to use as access points (as the first thing you'll do is disable the router capability) -- just buy a dedicated access point.
The Unifi access point I listed above covers all three floors of our house easily, and is very reliable. Our high-consumption devices (TVs, PCs) are all connected to a wired connection; the wireless serves guests, tablets, and phones.
As an added bonus, the Unifi access point has good guest network functionality, and you can program the access point to turn on-and-off on a regular schedule (eg, switched off overnight when your son should be sleeping!)
The reason I keep going on about the Unifi range is that their stuff is professional quality -- leagues ahead of anything available from the big consumer brands. Don't believe me? Go read the reviews on the Asus unit you linked and see how many people complain about dropped signals.
If you've already run the wiring and only have a single RJ-45 port, the solution is to plug the switch into the RJ-45 port, and everything else (including the Unifi access point) into the switch. Not quite as elegant, but it would work.