The stats you have listed are boarderline irrelevant when it comes to surrounds. Much morre important are dispersion patterns and voicing to your mains. Most speakers designed for main L&R duty are not an optimum choice for surround duty. For example, the Klipsch RB7 is an outstanding bookshelf speaker that retailed for about $800. The RS7 is a great surround speaker in the same line, and retailed for about $350. Even though the bookshelf model has greater power handling, better frequency response, and higher sensativity, it can't compete with the RS7, because it wasn't designed for surround use.
It's a fools game to pick audio equipment based on stats. As James said - listen to them all, and choose the best SOUNDING one:-)