I think I got your answer covered in the Projectors section of the forums. It's a great question, and I think that 4K is being overly touted for those just getting into it who are on more of a tight budget. The HT2050a will make many people VERY happy.
Make sure you learn about where you MUST put the projector. About one for for every ten inches of diagonal is where the front of the lens will be, and it will be about 3" above the top of the screen if ceiling mounted or 3" below the bottom edge of the screen if table mounted. This is typically very good for many people.
Plus, you may see a resale value of about half that price in a few years if it is still in good operation, which is nice if you want to upgrade to a serious 4K model and you get really serious about the room. Remember... theaters have NO lights, are painted dark with dark ceilings, walls, carpet, and furniture. So, if your room is typical white walls, white ceiling, beige carpet, you will take away from any experience, no matter the projector resolution. So, consider a coat of paint.