Rolling Thunder - I guarantee those will be good pants, but that is depending on what kind of hunting you're doing. Those 28oz pants are going to be very thick and very warm. If all you're doing is sitting in a stand and it's cold, they'll be great. If you plan on walking much, you will overheat and be sorry for wearing them. I'd look for a lower weight pant. The military surplus pants are great and very durable. Most places have an Army/Navy surplus store somewhere close that you can actually visit and feel the material to judge how heavy you want them. You should be able to find something for much less than $85 at the surplus store. You also probably will want to try them on since the sizes are not always the most accurate as they are labeled.
