The 10 year non spousal rule is a game changer. In the past year 2 of my high net worth clients inherited large IRA's. Because both are in their mid 50's they are in what they believe to be the prime of their careers financially. After review both chose to only take out their RMD and their plan is to ask their employers to not pay them in year 10 to avoid as much taxation as possible. As someone mentioned earlier this can change yearly depending on the BBB and other things. Remember that the income or withdrawals you take from the inherited IRA will be taxable on top of your yearly income.
If you are over $750K in income you might also consider simply taking the hit and being done with it.
Assuming my parents pass before me I will take out as much as possible without going into a higher tax bracket each year. I pray that's a long time from now.
Lastly, those of you with parents with IRA's you are aware of. A typical Mississippian has $50-$250K in their IRA at death. If you have financial control over their finances cash out their IRA before they pass and the distribution will be taxed at their income levels (assuming they are retired and living on SS) will be taxed at their income levels.
Lastly, each and every situation is different. Consult your CPA and a competent FA if you don't understand what I'm speaking of above.