Currently I'm using 2 Amigas: My original A2500 with a DKB megachip, DKB 2632 memory expansion, 2320 flicker fixer, GVP Spectrum graphics card and GVP hc+8 SCSI card. It is connected to both a DCTV and A Digi-View Gold through a parallel port switch box. It shares a keyboard, mouse, and monitor, through a KVM box, with an Amiga 4000/040 Video Toaster that has Picasso II graphics card and a GVP SCSI card in addition to the Toaster. I also have an A2000 Toaster that I'm not using and another A2000 for spare parts.
And I have an Atari Mega 4 St with an internal hard drive and a CLab unitor that I use for just one application: CLAB/Emagic Notator.
Also qualifying would be a 1998 Thinkpad laptop I own because I need it to run DOS so I can use my ROM burner.
And I won't even talk about all the retro sound equipment I own which predates my interest in retro computers by far.
I don't have space for a large collection and I prefer quality to quantity.