Recorded music can only get so good. I'd eliminate that weakness by building my own concert hall. A small venue with about 100 or so comfortable seats in a sonically perfect room, a fully stocked and staffed bar and grill, and a walk in humidor would do it for me.
I'd pay some bands to drop by and jam for me and some family and friends. It would be interesting to have a few drinks, food, and cigars with them.
I've heard some systems that probably cost more than the GDP of some small countries (maybe an exagerration, but you get my drift). While most of them sounded phenominal, they didn't come anywhere near what a concert - amplified or acoustic - sounds like in a great small venue.