There are a wide variety of AV receivers available in the stores today. However, bearing in mind that your ideal AV receiver will be the core of your home theater system and will be driving your loudspeakers and other functions. With all the features that AV receivers offer today, you can get pretty overwhelmed.
Your best bet would be to spend a significant amount of time doing some research online, to check out the available features in depth and consider which ones you want to have and which ones you don’t.
Do also check out some of the AV receiver reviews available on the Internet so you can get a better idea of what you will be purchasing.