Ahhh soooo annoying that it requires a Nexus 6. This sounds so awesome but I do not want a 6" phone. I'm hoping the next Nexus phone will have a smaller variant (and it will undoubtedly support Project Fi)
Edit: Looks like the Sony Z3C is a (and the only?) contender!
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But, I've also given up on that front. The last phone that was (barely) usable one-handed for me was the original Moto X. At this point, there is literally not a single phone on the market that (that I can find):
* Runs a recent version of Android (or iOS)
* Is <= 5" tall
* Has a recent/"fast" CPU/GPU
So, fuck it, time to give in and go with a phablet.
EDIT: maybe you could try drawing a screen with a 5.44" height and 4.7" diagonal. Euclid will not be your friend.
Increasing height to 5.1 inches (well, 130mm), gsmarena.com shows almost a dozen phones that suit your wishes.
(Personally, I'm still not happy about having to give up on having a hardware QWERTY keyboards on my phone :/ )
Probably that Nexus 5 reboot people are talking about.