I'll pipe in to suggest that speakers are the most important component in any system. So I'd recommend finding speakers you like most and that work in your room and budget. Then go about finding an amp the pairs best with those speakers.
That said, the M6i seems pretty burly and there's probably not a lot of speakers that it couldn't drive well.
That said, the M6i seems pretty burly and there's probably not a lot of speakers that it couldn't drive well.