I love my SK's in hot and humid FL they are great you can get them with out the elastic in the back I think just the "works" has it. I also have a USA casual and think it is made better looks better but it is a little warmer. I can't wear my SWK it dosen't fit in the hips.
Over all I say go with USA or SK depending on what you are going to do in it. If you are close enough to USA drive over and check them out that might be the thing to do.