txdefender's link is fine on my computer. it may have an expired certificate or something minor. I link to it a lot. basically it compares these scopes:
Burris Fullfield II 3-9x40
Redfield Revolution 3-9x40
Vortex Diamondback 3-9x40
Nikon ProStaff 3-9x40
Bushnell Elite 3-9x40
and ranks them
vortex
burris
bushnell
redfield
nikon
Honestly, I have been pleased with every scope I have ever had, from tasco, leupold, burris, nitrex, original redfield, nikon, simmons, vortex. Right now I'd lean toward vortex or nitrex for the money, but as you can see, everybody has favorites. Heck, I keep expecting the tasco and simmons to give up, but they keep going and going, moving from one rifle to the next..... The only one that kind of disappointed me was leupold (I guess I was just expecting more) and the only one that ever messed up was a vortex that was off out of the box (I discovered that vortex has CS second to none)
What I have learned (and this is a "duh" statement) is that the reticle matters. Not so much the overall shape as the thickness of the hairs. Thick is good when hunting, bad when punching paper, and it's kind of hard to tell how it's going to work out in the store.