First, if you do buy it don't go crazy on the price of the Gamo. It might shoot like a $1K gun, but it's still an oddball. The fancy 128 is rare and worth more than the 126, though.
As far as a scope, you can mount anything you want on it. No awkward recoil like a spring gun, and the receiver is quite long. But I don't actually have mine yet so I'd defer to a current owner for any of that info.
Personally I'd stick with the original peep sight unless you're going for longer range or something tricky. And until you get it chronographed (to make sure the booster is working) I'd forget hunting. Last thing you want to do is shoot a critter with a 425fps rifle.
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