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I know what you mean about being a sucker for a good deal. I still wouldn't buy the Sigma though. There are always good deals that will come along and you might wish you'd saved that money when the next one does.

Unless it's free I'd save my money for something else. I don't know much about them but they sure are ugly.
For just a little bit more you could get a Glock instead. As for cheap, I'd get a Taurus Mil Pro or 24/7 over a SW auto any day of the week.