Simply put, Amen!Regardless of what length you decide to go with, don't be tempted to save a few bucks on a Harris clone. They might look similar and might work ok for a rifle like a .22. However, they are not as well made and will not hold up as well in the long run.
I have a bipod and buttpad monopod setup so that I can get a solid three points of contact without lugging whats not already on my rifle.
Harris 6-9" notched leg, swivel, with pod-loc
If you want a snowmobile look....Those Sinclairs look awesome!