Antecs are generally good while not always being the ocer's dream. The floppy seeing the short was the likely problem being bad to start with.
I don't like the sound of the HD getting warm there. This is why trying out a different supply before anything else is damaged would be the idea. When setting the boot order the hard drive should have been set as the only boot device to see if that was still working.
One question comes to mind on all of this however. Was the system on when going to plug in the floppy drive? The arc seen when applying live power to a drive will flash burn a contact. This is why the system is off and even the breaker switch is usually switched off as well when going to connect any drive.