I just went through a LOT of looking. I brought home the non-HD Swarovski ATS 80 for a week. I was so disappointed in it. The purple chromatic fringing on everything at higher powers was awful. I just wanted to love it so badly. It wasn't meant to be. My excellent hunting store nearby took it back. I went and picked up an HD Swarovski STS. It IS all it's advertised to be. It's amazing.
I looked through the Vortex at the store. It just doesn't cut the mustard compared to the Swarovski HD. The store has a resolution scale (it goes to ridiculously fine increments but you need them with the better scopes) mounted on the wall (it's a large store) with window mounts on a board so you can side by side them.
Here's my take on the ones I looked through:
Bushnell HD FLP 80. This scope is AWESOME for less than $600 ($475 on Amazon). It kicked the pants off of all but the Swarovski, seriously. I was shocked. Had I not wanted a scope to be able to use with my camera, I'd own this scope, period. I never hear about it, but it's extremely impressive. I'm serious, this scope is a bargain of the century. Drawbacks: Made by the chicoms and can't use it with an SLR)
Bushnell HD FLP 65. Just like it's big brother, but dim. If you're a hunter, NO 65 in my opinion, is going to cut it. SUPER bargain.
Nikon Fieldscope 65. Pretty nice but honestly, the Bushnell HD FLP 65 was better than it. The Nikon seemed too dark at high resolution and didn't resolve any finer on the chart. I wanted to like this as it was on sale and I'd heard so much. I'm a big Nikon fan. This scope, for the money, disappointed me.
Vortex ED 80. It was a good performer. I especially liked the focuser on it. I could NOT bring out the resolution on the chart as well as the Swarovski. Just wouldn't do it, the chart doesn't lie. Pretty good for the money, but NOT as nice as the aforementioned Bushnell.
The others weren't worth mentioning.
In my opinion, one really needs the ED lenses.
Try this: Look at a branch against the sky or in the store, look at the edge of a florescent light. On the Swarovski HD, you'll notice no purple fringing or softness. Now, defocus it. On the Swarovski HD, you'll notice it just goes out of focus, no fringing. On others, and all the others, the purple fringing will pop out. This gives evidence of the correction capabilities of the scope. Believe it or not, the Bushnell just about pulled off a Swarovski copy cat here!
On branches, or antlers, I just couldn't put up with not being able to count brow tines at 500 yards in the early early morning. So, Swarovski HD it is!
Just one guy's opinion.