IMHO I would never buy a pre-balanced kit from anyone, for the same reason I wouldn't buy a kit and trust the fit and finish was as advertised. As my machinist buddy says "if it comes out of a box, it's #$%&ed up no matter who built it"

As for the parts themselves, the crank and rods are Chinese and one brand is pretty much as good as another once they are properly checked and corrected. I would buy the unbalanced kit, take it to a machinist that knows what he's doing (good luck with that) and have it balanced AFTER all the parts are checked and corrected.

Kevin