well if you want it for dress-up, get whatever cheapie you like. As for actual utility, not all designs are equal. You'll notice the bar bolts to the mount in one place on some, and two on others... So inherently, the ones that bolt up to each mount twice will eliminate flex, whereas the ones with only one bolt will reduce flex in a linear plane, but wont reduce "twisting" motions, which are more likely to be a problem while driving.

I got the neuspeed one. Its just one solid piece of steel, no bolts, no brackets... pretty much no way to bend the fawker. I'm happy with it.