I would really not recommend hk avr as ive heard of service issues with them. Denon seems really fine. No reason to not choose denon. Denon X500 is just a basic avr. Does not even have a USB port. Its just a basic one with little to no features thougb supports hd audio decoding. The power rating is same for both x510bt as well as x510. The plus points of x510bt are: 5.2 reciever, bluetooth, usb, 4k passthrough, auto eq aka. AUDYSSEY.You need to check if all these are important features to you. If not go for x500. I had a pc alongside so did not worry about much features. Also by doing this i could extend my budget for speakers, as speakers will really make an audible difference