My good old trusty Data I/O 29A with UniPak (it's an Eprom programming station from the 80's) that I just love too much as I can edit Eproms-on-the-fly and enter manual data on it, copy eproms, and it's compatible with the weirdest stuff on the planet.
Commodore SX-64, it's sort of a portable commodore 64 with built in 5.5 inch color screen & floppy disk...all in one practical unit, I have an assembler cartridge for it, and it's actually quite practical for coding 65xx series code on, and quick & dirty electronics projects I just connect to the I/O port (User Port), even in Basic.
My extreme stash of millions and millions of NOS Discrete components from the 50s to the 90s, I can literally built a spaceship with those things, doc Emmet Browns time machine is next. Transistors, Linear Circuits, Cmos, Timers, PCBs, MCUs, Static ram, roms, pal & gals (pain in the *** to program), resistors, solar panels, mics, crystals, coil formers, oscillators, capacitors, reed relays, diode galore, tubes tubes and even more tubes.
All my PCs I've built over some time, gets hard to part with them because 1) I can't get any money form them. 2) I always bought the best stuff. 3) It's not worth the agony of erasing all the pr0n...err...strike that last thing. And they're terribly practical for running old test gear, burners, peripherals etc. that doesn't work with todays computers.
My lovely old test instrument park, oscilloscopes (got at least 5 of them), spectrum analyzer, multimeters galore, function generators, frequency counters, PSUs and whatnots.
I don't even do this stuff enough justice, but you know what a MAN CAVE is? I just love to go into my MAN CAVE and sit there for serenity for hours and hours, even if it's just to write some pointless post here on Slashdot, and surrounded by all this cool stuff make me feel so 1337 H4xx0r and all that (no seriously...) it's like I'm a prop taken out of the old wargames movie (acoustic modems anyone?)
It feels so lovely sitting there with those things, knowing that any second I could build any project I'd ever want. (And I do from time to time), but just because they're THERE...I don't know if anyone of you know this feeling, but it's very energizing. Whenever I feel completely depleted (either me or my batteries) I go there and start at endless wastelands of components. Luuuuuv it!