As a computer collector I generally am looking for any type of computer accessory that has been around for 30 or more years. But that is a sort of moving target. I do have newer items and usually won’t turn anything down. Saying that, there are a few exceptions to that rule. Mostly relating to x86, aka PC’s, or as it was known back in the day, IBM compatible. I will usually just go ahead and gut any newer model PC for parts or art projects. If I started to collect beige towers, I’d quickly be over run with crappy yellowing computers.
Saying this, I do have a few items that I go out of my way to collect. These mostly include old IBM keyboards. I grab them every chance I get and have about 8 of them in various states.