Wow, didn't realize 'man cave' was so regional. I've always heard basements and bonus rooms referred to that way when they are over run with video games and computer parts.
Later this year, I'm going to move that TV out and get a nice projector. With the wall there, I believe I can get a 110" screen to fit just barely. Will probably have to move the thermostat. All the AV equipment below will be moved above the fireplace.
I'll be moving from 6.1 surround to 7.1 at that time as well. You can't see them, but there's a 2 surround and rear speaker at the moment.
I don't have the greatest system ever, but I think it's pretty solid for what I've spent and all the pieces have been good choices. Got the Infinity fronts and center around christmas time. Good stuff.