I know with the Enlighter 4K you get no moire but not sure of the other 2 (I have no knowledge on those screens), but I'm sure you're correct.
I'm pretty sure with a Seymour XD electric screen and the HW50, because of the pixel structure, you'll get no moire. Worth looking into. That combo might save you some cash and the HW50 is a better projector, IMHO.
The 5020 is an excellent projector as well and you got to love Epson and their handling of warranty issues.