Sorry I'm getting in here kinda late, but I had to give a lecture in a legal seminar to about 300 fellow lawyers all day today. It's refreshing to have a discussion with normal people. :wink:
Yes, when I said 3.5" of eye relief for the Elite 4200, I was talking about the 4x-16x-50. The others have anywhere between 3.0 to 3.3.
I have repeatedly said that my only gripe about the Elites is that their eye relief is pathetic - too dang short. Still, I really don't think that you are going to have to worry about it with a .308.
Now, as for the other models. I own the following makes and models:
Leupold Vari-X IIIs
Bushnell Elite 4200s
Burris Black Diamonds
Nikon Monarch
Nightforce NXS
The Vari-X IIIs have the longest eye relief, and they really are great scopes.
The Elite 4200s, in my opinion, have better glass, and they have rainguard, and 3" of eye relief for a .308 shouldn't be a problem.
I have no experience with the Burris model you mentioned.
Nikon monarchs are awesome, being about the same thing as an Elite 4200 without the rainguard, but with longer eye relief.
Bottom line - you simply can't go wrong with either the Vari-X III, Elite 4200, or Nikon Monarch.
Zachary