Nice shooting! I got a 4X ProDiamond earlier this year on sale at Wally World for $40 - couldn't pass it up.
I really like it so far - love the 4" of eye relief and it has good clarity. Haven't tested it in low light yet, though.
I wish they would have had a 2 - 7X, my only complaint is that I wish I had more magnification for longer shots.
Inside of 120 yards it should be deadly, though.