Speedloaders... prefer at least three. Think I doubled it for my two revolvers that take them.
Moonclips... or clips in general, I want at least 20. That includes stripper clips and en-blocs. My 9mm J-frame revolver, think I have at least 50 moonclips.
Magazines... my minimum is five. I try for more, especially carry guns. If it is a gun that magazines are hard to get, I try for as many as possible (S&W 10mm, Yugo Tokarev).