advice on projectors and screens

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I want to add video to my system for concert/music videos and know very little about it. I am looking for 2 channel for now so not really looking for audio advice, just video. I envision a ceiling mounted retractable screen of 80-100 inches and a projector. If you look at my system I see a screen hanging down in front of the speakers. I can make the room completely dark if needed.

I don't want to invest a lot of money but have no idea how much I need to get decent performance. My priority is sound quality which I already have but what will suffice for video?

How much do I need to spend on a projector and what are the specs that are most important for music videos?

Same question for screens.

Thanks.

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