Actually, just about any brand will be easier to use then a Denon IMO (apologies to all Denon owners).
Integr's are also very easy to use but I like the Marantz remotes a little better and Integra's are harder to find.
$750 can buy a lot of receiver with a refurb or closeout. But a higher end...
90% of all receivers priced anywhere near $750 will be 7.1 so they made that decision for you.
I've always found Denon receivers very difficult to setup and operate (my brother has a 1610).
For simplicity I recommend Marantz. The 6005 (hurry! Last one!) refurbished receiver from ac4l.com is...