I like West, but he isn't coming back-- at least not this year. He's worth more to the Cavs right now than he is to the Celtics, because he's the only pg Cleveland has.. They didn't draft one, either. So the Cavs are almost forced to match any offer sheet that West would be willing to sign.
If West plays for the QO, he might be willing to come back to the Celtics next year, when he's unrestricted.