HI PuffBus. Welcome to Geekhack.
It doesn't need to be rare or expensive, just what's most interesting/useful to you.
I would certainly hope that nobody would go into it with that sort of attitude. I don't really see it around here, and certainly didn't receive it when asking about parts for a 60% board, which is still out in the ether somewhere in China. Some people know plenty about keyboards, switches, etc, but know nothing about kit boards, or vice versa. We're all in this for an exchange of knowledge and ideas.
I'm interested in what switches you went with.