ORIGINAL: Underclocked
Several have purchased the Nikon ProStaff 2x7 and I've yet to hear/read anything but praise for the scope.
U29654
6308
PROSTAFF 2-7X32 SHOTGUN MATTE
MAX
$112.69
That's at
http://www.ultout.com/nikon-optics.htm
It's shorter than either of the BuckMaster models you mention and offers good eye-relief. Should be plenty of scope for your rifle. Be sure to buy good mounts.
+1, I have two, one on my muzzleloader and one on my slug gun. I plan on getting another after the season.....maybe there will be some year end sales. Keep your eyes open.