Out of those two choices I'd say go with the Sig. Better quality control and better small parts then the Kimber at a lower price. The Sigs aren't perfect though. The geometry of the external extractor is off. The EE is positioned too high and does not allow proper contact of the extractor claw on the case rim. This tends to lead to erratic ejection patterns. The gun may still run but the extractor is not optimal.
A better choice in the same price range would be the S&W E-series. Other then the external extractor that must be sent to Smith to be serviced they are a good gun for the money. If you could stand to go up in price range the Colt XSE or Dan Wesson Heritage are both good guns with the Dan Wessons build quality being the best at that price point that I have seen.