Also, get copies of every financial statement you can get your hands on, ASAP. Does he have money in 401ks or IRAs? How much? Run a credit check on him to see if he's been taking out loans you don't know about. Take half of any joint accounts and put it in a separate account (to protect you against him draining the accounts).
Run EVERYTHING by your attorney - they will be hip to these tricks.
And, are you comfortable with your CPA doing the business valuation, or do you think you need an outside auditor? Do you think you might need a forensic accountant? (Sometimes these guys are very clever at hiding money).
