Thanks for the info, I'll look into those routers also..well, not the Asus I'm afraid due to the whole vpn/proxy thing..sadly.
I'll certainly re-test (not as good as professional testing of course, but the results in my home are those that count for me) and will try to re-adjust the antennas also. I did see that the 5Ghz pushed a bit further, but for me it was of no use since it was like 1,2 megabit or something. Not that I plan to download anything sitting in the corner of my attic covered in dust, but still
It isn't an upgrade for me at this time, but then again wifi/range can only do so much. For one person the range and speeds matter, for another it's also about stability and functions.
And let's face it: a lot of countries don't offer affordable 50Mbit+ internet, so the router can be as fancy as can be, you won't be able to use the speed.
Wifi is another thing entirely, since you need equipment (laptops, pc's) with 3 antennas to maximise the speed. Smartphones are limited by hardware (flash memory). Funny when you think of it..