It would be a couple of years before HDMI 2.0 and HDCP 2.2 will become limiting in any meaningful way. I would advise you re-evaluate your need for them.
The Onkyo NR636 on
A4L (refurb) $370 or
(new) $500, is the price of entry. Oddly, the NR737 is also
$500 new and includes a Sennheiser HD201 Headphones, 2x 7' HDMI cables and Monster Power strip (and screen cleaning kit
). That 737 deal is actually wicked good since A4L has the (refurb)
737 for $490.
That said, the 636 and 737 use Onkyo's in house flavor of room correction in place of the excellent Audyssey processing. IMO, this alone is a deal breaker for many (myself included). For example, I would happily trade HDMI 2.0 and DHCP 2.2 for Audyssey Silver, like the A4L (refurb)
Denon X1000 for $219.