Range. Best range.Under what criteria? I don't think there is any actual "best" in all catagories.
I like "under 70" but the lower, the better.Well, that's different. What's your budget?
Well, "current proof". Something right now without 802.11ac wouldn't really make sense unless the price doesn't justify it.There's no such thing as "future proof".
Ive heard awesome results from Amped Wireless as well just like I heard about Ubiquiti. Ubiquiti is a bit more expensive. Also Amped Wireless isn't available world wide.I've had decent results from Amped Wireless AP20000G, 2.4ghz/5ghz and it has good/great range.
Then there it isIf you want AC, you'll be paying for it. Unifi AC AP is about $300 US Personally, I'd wait another year before going with AC so they can work out some lingering issues with it but that's just my opinion. My vote's still on Ubiquiti Unifi. I use them all the time for projects and have one in my house, work great.