Right now, the Nexus 5X is being discounted and rumors are swirling about a new generation of Nexus phones, supposedly to be made by HTC. (Remember them? Not dead yet!) I don't buy into rumors much, but dropping prices on old gear are hard to ignore. Here one link to a Nexus 5X bargain.

Why wait? If you're looking for a higher-end phone, as in something with 128GB internally, then you might as well wait for the "VR-ready" phones that are coming soon. At Google IO, earlier this summer, Google spoke of a standardized minimum spec for phones meant to run VR applications. That will presumably include a 4K display and other GPU-related goodies, and if you want to get serious about VR, then you want to be downloading and caching lots of geometry and imagery, which would imply more Flash storage.