Ugh.. that's crazy man, yeah those old DLP's were massive beasts. If I had the space in my house I'd definitely go the projection route for HT and just leave a moderately sized TV in the living room for regular TV watching and whatnot and wouldn't care if it's 4k or not. I just use the TV speakers on the TV in my bedroom (which happens to be my old Panny plasma), and moving her into the bedroom was literally the first time in her life her native speakers were even put to use. I don't need crazy HT sound in my bedroom. I usually just use it to watch the news at night as I'm going to sleep or maybe some kind of mindless show to help me fall asleep.
So yeah, true story - when I decided to go ahead and buy the new 4K TV I was faced with a conundrum. That 50" Panny plasma was no longer the centerpiece of my living room HT and I actually put it up for sale. Had a few offers on it, but they were all (what I felt anyway) lowball offers for a TV of that quality. But a sense of sadness was growing within me too during this.. as I haggled with one potential buyer then another, I realized that I actually felt sentimental towards that TV. I truly hated to see her go. As silly as that sounds, it's the truth. So I finally had a buyer lined up who had agreed to pay me (close enough) to my asking price and was on her way. At that moment a pang of regret struck me hard, so I texted her back saying sorry - it's no longer for sale. She wasn't happy about it at all of course, so I offered her a compromise. I'd sell her the (just as old) Vizio 32" LCD TV that had been in my bedroom for years for $40 out the door. Sold. She was happy again, came and picked it up pronto and I promptly put that beautiful Panny atop my dresser in the bedroom.
It's so big in there that it actually looks ridiculous. It is about twice the amount of TV we need but I don't care. I didn't want to give her up. She'll sit there and be a part of my life until the day she dies, hopefully later than sooner...