Starrsoft's Win96 is widely regarded as the best for the Pro-96. But don't take my word for it, take advantage of its full-function 30-day free trial.
A word of caution -- Don Starr seems a bit backlogged when it comes to manually issuing authorization codes. This is only an issue if you're paying by check or money order or something like that. As long as you go through his online payment service (Paypal, I believe) then the authorization code is automated and should be e-mailed to you quickly.
Jim