I bought a sporterized Nagant that has iron sights mounted on the 3/8" dovetail that is machined into the receiver.

I bought some scope rings to fit the dovetail and am curious of what scope to purchase. I realize I need a scout/pistol scope. What kind of scopes has anyone had success with?
Something in the $100-$150 range. Is a variable power necessary?

Any advise/insite would be appreciated. Craig W.