Wow, you are one of those guys that can LEGALLY use all the roms, aren't you!
I don't have much in the way of console stuff. I have a working atari 800 with a dozen or so carts, and maybe 15-20 games for systems I don't actually own (2600, Genesis, nes, snes, N64, Sega CD, Dreamcast).
I DO have 15 Neo Geo carts, and maybe 30 or so arcade PCB boards. I just wish boards were as easy to store as carts were.