The only systems I have extensive (or any) stuff for is the Apple II and TRS-80 Pocket Computer 1, 2, and 4. Those are life keepers. My 2 /// and 2 ///+ are of little or no sentimental value - basically shit off ebay when I was bored.
I had way too many good times and way too many interesting stories (for a kid) built around the Apple II to get rid of that stuff. And Pocket Computer stuff is more like a calculator, and that all fits in 2 rubbermaid tubs.