Eddie,
Don't skimp out and go cheap-you may not be able to hear the difference, but Oscar will!!!
Sounds like your hearing is like a lot of us who probably should have been more careful when we were younger. In the 60's and 70's, no one I know took any precautions, and now am paying the price in addition to the normal hearing loss from getting older. I did get a little smarter as I got older, but not nearly soon enough.
My $.02-take the advice of some of the others who have suggested getting a good subwoofer. To me, that's what really drives the listening experience when watching action movies. For example, that's why going out to the movies is still so popular-most of the better theatres have great sound systems, and part of that is the bass range from good subwoofers. Also, like a lot of things, getting good advice from a pro you trust will really help you get comfortable with whatever you decide to get.
I'm enjoying this thread, as I'm getting ready to upgrade the older Sony system we're using in our lower level. It's served us well, but the room is really too large for the small subwoofer that came with this system. It worked well in our other home family room, but I had to leave the built in system with that house when we moved. FWIW, I had a Denon reciever with that system and loved it.
By the way, I didn't think you ever took any "downtime", judging by all you've built and are doing at your place. I enjoy seeing what all you've done and the craftsmanship, and following Oscar's story. Good luck!
GGB