Forgot to mention something--usually router antennas are designed for stronger horizontal signals. If you need to reach the basement well, you may need to jockey things around a bit, which in turn will cause sacrifices in the other directions. It becomes more and more clear that having enough access points is #1. My 3200 has been better than my other ASUS routers, but it's definitely not trouble-free. I'm still having issues on the latest firmware, though it's far more liveable than it was back when it first came out, when I was rebooting it multiple times nightly, if it didn't reboot all on its own (I can still hear my son's cries of pain as he was booted off Xbox matches randomly). I am definitely interested in the new crop of routers, but more so for the 40% cpu boost than anything else. That the firmware major rev has jumped 2 versions, however, gives me pause as I have never ever had good luck with brand new firmware from any manufacturer. I count myself lucky if I get a good 6 months in between the time the firmware stabilizes and my hardware burns out.
My 3200 has remained up for a full month...once. But when it crashed I had to power cycle every network appliance that was connected to get it to come back up. I was encouraged by a 7-day stint I had with the .9135 firmware, but with the latest firmware (.9313), it looks like 2 nights is when things start to go south, with random bandwidth drops for no good reason that I can ascertain, other than maybe that my neighbours have routers running like +20dB over normal/legal signal levels (I am receiving them at -10dB in the middle of my house, something I don't get close to even standing right next to my own router). Their routers identify as TP-Link, BTW, though I'm not sure whether that is accurate, because I've seen some pretty obscure MAC manufacturer codes come in over the past year using the same SSIDs, including "Xerox" and "Google Fiber," which isn't even anywhere nearby.
I hope you have better luck than I have in getting your network permanently stable.