[haus]

I usually just put the ROM name in the front, like mighty_RHODIMG.nbh. The one that doesn't have the name prefix on there when you flash is the one that gets written, of course.

Of course the problem comes when you can't remember which ROM is the one that doesn't have the prefix, so I'd throw them all in a folder with descriptive names and then copy (rather than move) the one you want to the root level and give it the correct name (RHODIMG.nbh) before you want to flash.