Long term reliability is a major concern. My current ancient Mitsubishi HC6500 1080P projector has never hiccupped over 15 years of moderate use-3rd or 4th bulb now.\n\nCa. 4-5 years ago my friend bought Epson's first series of 4k-Enhanced projectors (she got the $3k "Pro" model.) I loved the performance, even upscaling lowly 1080P, but she had service problems after a couple years. \n\nRoom has almost total light control. 92" perforated retractable screen (ca. $1100 SRP) was new when I mounted the projector 15 years ago.\n\nI went through the misery of hiding the HDMI cable in the ceiling but stupidly did not install a conduit through which I can pull a new HDMI, which I presume is required for 4k or "Enhanced 4k." Total HDMI length from the receiver to projector ca. 25' as it is now (straight up the front wall and back to the projector in the ceiling.) Should I convert to ethernet? If I convert to ethernet and if ca. 50' ethernet is OK, I could run ethernet from the receiver to the floor, to the office on the R wall, along the floor, up next to the door frame, to the ceiling, toward the back wall, then back into the studio and finally 8' over to the projector. \n\nMy current projector is mounted only 1' behind my head, ceiling only 7.6'. The Mitsu is dead quiet. I presume the new projector will make much more fan noise. I can mount the new projector closer to the back wall (10' behind the chairs) to minimize fan noise. If necessary, I can also hang a short, damped board between the front of the projector and chairs to minimize noise.