If you can find a Karl Niedersuss, grab it!! They are by far my favorite saddles.
Anyways, those Harry Dabbs saddles aren't the greatest. They can work for some riders, but they usually just end up mucking about with your position. That Bucks County saddle looks like it was made in india with leather from a possum or other rodent, not quality at all.
Depending on your build, you're going to like different saddles and the rest that you've listed are worth a look. I would start with the Stubben and the Passier to give you a good base on what you like and don't like and narrow down styles from there.
It is very useful to get a saddle fitter out to identify brands that work with your horse as well (to narrow brands down).
And try to find a KN and a Windsor to try.