[citation][nom]ikyung[/nom]I actually still have my old Commodore 64 in my closet. Working condition with the box. Hopefully, it will be worth something in 30-40 years when I retire haha.[/citation]
C64s were so common, unless they are new in box, they're not worth much. I have at least four never used ones, and I'm hoping they go up too, but so far, not that much. It's never a machine I particularly liked, even when it came out it was kind of cheesy. I have VIC-20s too, and they're worth even less. Amigas are worth a lot, but liked them even less than other Commodore stuff, so don't have any. If you do, they'll probably go up as they get rarer.
If you've got Pentium Pros, they sell for a lot. Apparently, they have a lot of gold in them, so you can get $20 a pop EASILY. I sold 10 crappy ones in less than 10 minutes on eBay for $200. I still have five new ones (four with 1m cache, so they are way too cool to be sold for scrap), but if you any beaten up ones, now might be a good time to get what you can for them. If gold goes down, so will their value, since that seems to be what it is based on.
If you have a 68030 based Ataris, they are worth lots of money, even now. I'm guessing they'll also be worth holding on to, since people love those things, and they weren't nearly as common as the Amiga.