If you get buffer, spring the extra cash for 8"
Belt sander will work as a linisher, just use red rough on belt.
It will still be real aggressive but will also make short work of nasty stuff.
1" is really a bit narrow though, most linishers are 4"~6" (maybe wider but I've never used one of those)
Generally better to use a stitched mop, cement and emery powder to make super fine 'soft' grinding wheels on a polisher