Hog, I couldn't really tell you the best, but I know what I use has always seemed to work really well. I use the Scent Shield Fall Blend clothes and boot spray for a cover scent. It has human scent eliminator in it plus the cover scent of leaves/dirt. I have been using it for years and have always had close encounters with elk, 5 yards and less. The detergent I use is Scent Shield clothes wash. It is unscented but says destroys human scent and contains no UV brighteners. I just recently started using laundry soap this year, as I have always been able to get close with just using spray and wafers. I also use Scent Shield deodorant, this is a great product to me because I'm out elk hunting for usually 2 weeks straight during my season. It really keeps the sweat down and covers my scent very well. I'm sure there will be a lot more posts on other good products, this is just the one I use and really the only one I'm familiar with because I've always had success with it. Hopefully this will help you out!
I would go with Dead Down wind for sure. The shelf life is 2 years so this stuff will last. Make sure you use more then just spray also make sure you shower with scent free soap and wash your cloths.*I know you know this* You can find them right here at one place too. http://www.bowhunting.com/shopping/Departments/Scent-Control.aspx
One problem I failed to mention is most sprays only are advertised to work on "human" odor. Some just say they kill odors. I kinda want one good for everything if there is such a thing. I've used several and have had some luck with some. The one I'm using right now I'm not too sure of so I just want some opinions and examples. thanks for all the ones so far! lp