The Sig GSR's ahve a reputation for problems, they are made of good parts if Sig could just get down the assembly of the guns.
Kimber frankly is not so great either and might make the cut in evaluating low end 1911's but I'd nver buy their high end guns... much better choices out there.
Frankly in that price range (we are talking 1k plus here right?) I would NEVER buy a sig / kimber / smith / springfield... look at makers such as Wilson, Brown, Baer, there are soem very real differances that you will be able to apreciate and you will likley be much happier with a gun from them in this price range than a pig with lipstick from the other makers.