Man caves have been around for some time now, and are not decreasing in popularity. If anything, they have spurred the female version, she sheds, as some call them. The main idea for both is that each person has a space that they are surrounded by and with the things they love and enjoy. Whether that is crafting items or electric guitars and band posters.
One of the newer interests right now it music lovers getting in to vinyl again. Of course, this means having to purchase a turntable. You could find a vintage console and replace the items with newer version, or you can opt for one of the many turntables on the market now. If you haven't looked lately, take a look, you will be surprised at the technology! This also means people are buying music, whether new or old, on vinly. The newer vinyl is obviously better sounding than older, but people collect a mixture. Companies are remastering albums to sound more up to today's standards. One of these companies is MoFi (Mobile Fidelity Sound Lab). You can find their items at home theatre retailers, like Selby Acoustics.
It is up to you how you customize your space, the great thing about newer turntables is that they can also play audio files, connect usb, etc- so you can use it as more than just a record player. They don't take up too much space and some of them even look pretty cool. And having album art hanging around your man cave is adding to decor, as well as cool factor.