Interesting choice; Mavericks is the one OS that Apple pulled from distribution and hasn’t provided a signed updated installer for. It has known security vulnerabilities and a few showstopper bugs.
It’s the OS I would have settled on except for the number of things that are broken in it.
So instead, I settled on El Capitan with a Snow Leopard image for non-Internet things. This runs on my x86 Mac hardware; for my PPC Macs, I dual boot between OS 9 and 10.4.
Anything else happens under emulation.