The great thing about Medicare is that you can build your train the way you want. You can change the train cars every year. But the important aspect is that you own the Medicare engine. You are the engineer and you can build your train the way you want it.
I have created a spreadsheet that is fairly simple to pop in premiums, monthly drug copay and any deductible to determine a yearly estimated cost of the plan. Perhaps the most daunting aspect is collecting the data. Each plan publishes a drug formulary that will list if the drug is covered, the tier, copay for each tier and any deductible.