Actually, non tempered is what you want. Commercially made glass tops are non-tempered. When tempered glass breaks, it shatters into many pieces. Non-tempered glass will just crack. I've cracked a couple of glass tops and it was as simple as removing the two cracked pieces, having another piece cut, and replacing it.
I'd say it's cheaper too, but that's just my assumption, I've never actually priced tempered glass.
if you would have had temperd glass it wouldnt have broken at all as temperd glass is much stronger.