Re: Turning Over Popper Issues
6' of straight 10# mono should do it fine. I like Berkley Big game as it has just the right stiffness. A loop knot will help with wind resistance/turnover as well.
You also don't mention the style of popper. Something like a Lefties bug or Gurgler will turn over easily. Something that is fat with lots of hackle and rubber legs will have more resistance. For this type of popper I like to open my loop a bit.