If you are worried about cosmetics, then be prepared for fitment issues with any of the aftermarket headlight options. Part of the problem is the bracket; the two solutions seem to be to swap over the OE bracket and/or use shims to push the headlight further forward and close the gap between it and the bumper. Even then, fitment isn't always exactly as perfect as the original pieces.
And, for anyone interested, it's not possible to get the assembly line original housings from GM any longer. If you order from the dealer, you get the same aftermarket Depo housings that are sold for MUCH less all over the internet (the only difference with the GM version is the markings on the lens, but it's still made by Depo.)