I would go this way, too. I'd give them a specific start date. If they're not OK with letting you fulfill your "other commitments" before that date, or if the

I would go this way, too. I'd give them a specific start date. If they're not OK with letting you fulfill your "other commitments" before that date, or if they press you to divulge what those commitments are and why they're so important, you didn't want to work for them anyway.