In any case, you ended up with a really neat gun.  You'll have a lot of fun with it, they're great guns.  As the revolver is in .45 Colt, I would stick with a fixed 2X optical scope, it'll do everything you need with that caliber.  Leupolds are fantastic, but expensive, but Nikon makes a really good one for about half the money, and Weaver has one called a classic which is a really nice little scope for about $150 dollars.  
The thing is, the ballistics of a .45 Colt just don't warrant a variable scope.  The caliber just can't make good use of the extra magnification.  It's a heavy, slow bullet, and the 2X will work fine.  Good luck with it, enjoy!