I enjoy a good mag dump as much as the next guy, but are you honestly going with the quantity over quality argument here? That argument can be used for a good many things, but number of shots shouldnt be one of them! I guess I expect to hit something when I pull the trigger, and strive for every shot to hit its mark. i would NEVER advocate the spray and pray method, regardless of magazine capacity. Having additional rounds on hand doesnt mean you shouldnt strive to make every shot countirons, they make 20-30 round mags for a reason
As far as cheap red dots go, I'll agree with the consensus thus far...Primary Arms. I have one for my AR, and its performed well. It may be getting moved to an AK soon though, as I have already scoped the AR-15, as I used it (successfully) for deer season this year.