I've got a man cave.
It started as Notre Dame theme, but quickly morphed into a Irish, NY Jet, Blackhawk, & White Sox mix up.
I don't have a lot of the high end collector stuff, but I do have 6 framed jerseys, a bunch of framed photos, banners, shamrock on my pool table, Irish and Jets full size helmets, a foul ball my Dad caught in the 05 World Series and a Super Chexx bubble hockey table.
It isn't very big since I split the basement and gave my Wife a big laundry room and a guest bedroom. I didn't have room for a proper wet bar so I just built custom bar ledge around the pool table.
I spend every evening down there after the kids go to sleep!