between these entry models, you compare the features, power and price. consider as well ease of use of remote and their aesthetics...
Denon 2015: x1200W, x2200W
2016: x1300W, x2300W, x3300W
Onkyo 2015: NR646. NR747
2016: SR444. NR555, NR656
were you really proved the culprit is your long HDMI cable? how long is it, more that 15ft or more than 25ft? what if you use the same NMT & long HDMI cable but connect with a LED TV?
there are also other HDMI cable masters here in PDVD... perhaps it's also good to consider asking which type of HDMI will best support your HT environment/set-up.