I don't do cabs now either. I did have an Astro city which I parted with earlier this year. I don't miss the hassle of rotating the monitor, messing with looms, wires, plugs, coin mechs and all the faults that go with ownership.
I know it's part of the hobby and it's true, playing on a cab is near-on unbeatable. I do miss the cab from time to time, but I find it easier to just power on the Sigma Raijin, kick my Ikegami over on it's side and mash up some spaceships! No fuss, no mess, no hassle!
In terms of system ownership, I started with the C64 then progressed to the SNES, N64 and PS1. I dropped out of gaming altogether after that only to get back in to it about 4 years ago. Now I primarily collect shooting games, although I have a soft spot for JRPG's, bizarre one-off titles and a bit of Bomberman and Puyo Puyo.
I also collect superplay titles on DVD, VHS, Laserdisc etc. Again, the focus is on shooting games. Pride of place in my collection is my signed Clover-TAC Progear VHS tape!
As to what I would like to collect? X68000, PC-9801, FM Towns and MSX stuff would be fantastic (love Mr. Deadites doujin and Midi videos on YT!
) but shipping weight means items like that are just far too cost prohibitive and thus well out of my reach. I've also got this odd idea that buying a PC-FX just for Zeroigar would be a great idea...