I've searched this site to no end, and there isn't much info on spotters, unless it's Vortex or Swaro. The site is sponsored by Vortex, so you get a bunch of comments towards that, and then the guys who just chime in "you aren't a real hunter unless you have Swaro...".
For what it's worth, I've heard very good things about Nikon ED glass; but not so much on the ProStaff scope. Try simply Googling your scope, and read some reviews out there on the net.
It comes down to your usage requirements. If you're hunting a $hitton during the year, you might be serious enough to look at the more expensive brands. But, if you're an average guy, I would save up for another month and take a good look at the Nikon ED glass for around $750.