RE: Simmons Aetec, Bushnell Elite 3200, Nikon Buckmaster.......
Of the ones you listed I would chose the Elite 3200. The optics are better than the others you have mentioned . The Aetec is very good optically; however, they are not known to be a very durable scope.
The Elite 3200 is in the same class as the newer VX II and is better than the older Vari X II.
If you are on a limited budget, the Elite 3200 would be a very good choice.