it really depends on your budget $?
what you really want to do with it?
how much rms watts output?
multi selection between various devices or only a few devices?
built in tuner & extras you may never need?
number of speakers to connect 5.1 7.1 7.2 8.1 etc.
if you can answer some of these questions 1st then searching the forums for brands etc should be alot easier.
harmon kardon, nad, bose, pioneer, yamaha, lg, panasonic etc.
pick a budget say $200-500 & see what you can get then tick off what you really want & think you need.
take your time dont be pressured