depends on your other financial obligations, and as we don't know them, it's not really up to us.
and do you need money to put a ring on her finger? or still too soon?
only you know what your bank account can handle.
But if you have the money for something like that, why not look at a Leica again and keep the 5DmkIII when it comes back or just go Leica, I know you like them