If you haven't bought yet, try the Konus spotters. They make an 80mm for about $200 and a 100mm for about $330. I have the 100mm and it's quite good all things considered; it's also very large, so range use only. I've heard good things about the 80mm, although I've never looked through one.
At one point I bought several Konus rifle scopes. The regular grade pistol scope had glass so bad it was like looking through the bottom of a Coke bottle. The M30 scopes are ok for the money, but also very heavy. I'm not a rabid Konus fan, but my 100mm spotter is pretty good for the price.
NRA Endowment & DSC Lifer