Opportunity Module: Diff Sales Stage for diff product - CRM 2011

Under opportunity module, because we sell different products we can have different sales stage, how do I show different sales stages for different opportunity product?

I would also love to hear what other business user implemented? Some suggested to use broad definition of sale stages; but what if my user of a certain department wants granular tracking: 1) In Progress - Pending Doc 2) In Progress - Pending Credit 3) In Progress - Pending Review