I may look into the trade-in program but my need to put the subs up front may limit my ability to change the wall depth.

As for the distance to screen, I'm still researching but I think as calculators go, it's not apples to apples when using the same calc for TVs vs Projectors. Seems pixel shifting (esp with DLP chips) techniques help to hide those pesky pixels from showing up when you sit closer even on 1080p sources.