In your budget, you should seriously consider the new Outlaw subwoofer, which was designed Outlaw by Hsu. The sub is sold direct by Outlaw, and it has gotten some excellent reviews.
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I would add another ep-175 to the system. A pair will add greater output and blend much better with your system than any single sub could in your price range.
With the money left over pick-up the Outlaw audio ICBM bass management X-over and run them in stereo...you will need a fairly high X-over setting with the little M-22's anyway so the stereo setting will be a big plus.
I could never go back to a one sub setup in my system.