Yeah I'm a bit of a retro freak, have a pretty huge collection and always buying ****. I've got most consoles but have larger collections of games on Nintendo's. I just got a Jap Saturn though so I've been buying arcade ports for that recently.
I'd say like 80% of my gaming time is spent on retro games and a lot of that in MAME trying to 1cc games. I play Wii U and PC the rest of the time and have barely touched my PS4 and Xbox.
As soon as we move out of this apartment I'm going to buy either a a Namco cyber lead or an egret 2 cabinet and build a hyperspin PC setup for it. I've helped friends build cabinets with LCDs but I'm a snob and play almost everything retro on CRTs. My brother works in TV and his work recently upgraded to HD and were selling off their old equipment cheap so I managed to get 6 Sony PVMs of various sizes for $100 and I love these things so much. I've still got an XRGB Mini for playing older consoles on LCD but nothing beats the real thing.
If you want a frontend for a gaming only HTPC then I highly recommend Hyperspin. People I've shown have been instantly blown away by it because it looks so nice however it can be a pain in the ass to setup. It's worth the effort imo though.
Also this is the best all around retro gamepad I've ever used for PC. One of the best d-pads of all time. It's like $40 on ebay.