Currently....nothing super rare but this is my collection in order of rarity.....be ready for LOTS of NEC......
1.) Creeping Net 486 - only one like it out there, closest match is DaveJustDave's on Youtube, we have the same case and are both 486s
2.) GEM Computer Products 286 - GEM Computer Products stuff is hard to get since most of it went to US Military installations
3.) NEC Versa M/75 w/ Touch Screen - a convertible tablet/Laptop combo from 1994 with bare finger touch AND Pen support (restoring that screen currently)
4.) NEC Versa P/75 - The last version of the PC-4xx Versa which had a Pentium 75 and SoundBlaster sound, and a WORKING Battery
5.) NEC Ultralite Versa - it's in pieces, has the original "Brick" power adapter, I'm restoring it, these early ones are less common than the above
6.) NES Versa 40EC - Seems the E-series was the most popular of the Versa laptops early on, Caterpillar, Ford, and Microsoft had them for deployment
7.) NEC Ready 9522 - I still see a few on e-bay every year, mine's a Pentium 100 model, the P/75 eats it for lunch though so I use the P/75 more
8.) NEC Versa V/50 - I just got this, I know one other YouTuber with one, Beige-O-Vision, his is a rarer DTSN model, mine's Active Matrix, seen 4 on the bay
9.) Tandy 1000A - despite the high prices everyone has one of these and they're all over E-bay, Clint from LGR, 8-bit Guy, Me, not sure why they're $100+
10.) Apple Macintosh SE FDHD - Commoon, I see these all over E-bay, model M5011, that's why it's #10, more common than the Tandy
But the rarest item I own is actually a piece of medical technology known as a Words+ System 2000 Commpac - it's an AAC (Augmentative Adaptive Communications) device from the company that started with an Auburn University Professor who also worked with Stephen Hawking to develop his speech synthesizer (for all I know Hawking used this actual model in the 90's). It connects to the serial and parallel ports of a computer and uses various pieces of software such as "Talking Screen" or "EZ Keys" to commuincate (which I have them backed up off the M/75's original hard drive and now have them on a newer 80GB drive). This thing looks like it was a prototype - the casing is epoxied together out of black haircell ABS plastic, parts of it look like a custom-mod job to velcro it to the NEC Versa M/75 it was attached to, it had a modified Socket I/O Serial card on it (which I removed and now it uses the Versa Dock directly, and far more reliably I might add). All I have is the unit though, I took out the rotted battery, wired it up for a 9V AC adaptor, no switches, no IR proximity/movement sensors, just straight up keyboard input for now. It's actually come in handy as a musician to record computer voices with Auto Tune and it sounds really cool or really funny depending on what the musical scenario calls for.