Well, half the joy of home-brew speakers at least is that you can cheaply and easily replace the actual drivers!
Sadly I know little about projectors these days. 720p is cheap as dirt, 1080p still commands a hefty pricetag.
To me, 1080p under $1500 is pretty cheap. I went with the first sub-$1.5k 1080p that hit the market (Mitsubishi), and have been happy with it for.. what, 5 years now? Black is gray and brightness isn't great, but it does its job on the cheap, plus it's whisper quiet. After having an older 720p projector that was louder than 290X on Uber, I realize I'm willing to sacrifice a lot for having a quiet projector. It's sitting right above your head, and if it's loud, it's a huge distraction