I'll weigh in here. Of the listed guns, I'd go with the Springfield over the Sig, Kimber or Smith. The reason being that the Springfield is the only one of the lot that doesn't have a firing pin block type safety. While Kimber can turn out a fine 1911, I've had a number of them and found them to be hit or miss.
Specifically, I have an Eclipse Custom II (first ever 1911 with a firing pin block safety) and while re-assembling the gun after a routine cleaning, sheared the top of the pin that disengages the firing pin block because I was holding gun by the grip as normal causing the pin to protrude up from the frame. Took a trip back to Kimber to have the part replaced. They also replaced the slide with new assembly with a traditional extractor to try and address some of the reliability issues I was having at that time. Aside from that, the gun functioned fine when using 230 ball ammo, HP's were very much hit or miss. I had the best luck with Federal Hydra-shoks, but even with those the gun is less than 100%; Corbon Pow'r Ball is the only defense ammo that's been 100% in that gun.
I had a Custom Royal II that had all kind of issues including a thumb safety breakage, complete lack of reliability with ball or JHP ammo, and I also had to replace the ejector in this gun. Next Kimber was a Desert Warrior and while function was pretty decent, it was still picky with magazines. The gun worked beautifully with Wilson #47 7 round mags, but tended to not like 8 round mags (frequent stovepipe feeds) and for some reason or another didn't like my 7 round Checkmate mags either. I also had to replace the slide stop on this as the part broke at the axel.
On the other hand, I've had and still have a number of Springfield 1911's that run very well. I've got a parkerized Loaded full size pistol that I've not had any problems with, but you really get what you pay for. Frame sits ever so slightly proud of the slide, but it has not affect function at all. This gun has been upgraded over the time I've had it with a Wilson drop in match grade barrel and bushing, a pinned Wilson Bulletproof ejector and a Wilson single sided bulletproof tactical thumb safety. I've got a Springfield MC Operator that has been 100% and which has much better fit and finish than the loaded. The only thing that was changed on it was swapping the factory ambidexterous safety for a Wilson bulletproof single sided tactical safety. I had a stainless TRP that I carried daily right up until I got my Wilson CQB Compact...idiotically the I sold the TRP shortly after getting the Wilson. The only changes to the TRP were again swapping the ambidexterous thumb safety for a Wilson bulletproof single sided safety and swapping the full length guide rod for a conventional short guide rod and end plug.
I also have a Springfield EMP 9mm that gets carried during the summer months and it's been 100%. I have not encountered any function issues with the Springfields that have REQUIRED the parts changes I've made, but I instead made them based on personal preference.
As has been stated earlier, Sig, while a good 1911, has odd slide dimensions that can make finding a holster a little more of a challenge, it also has an external extractor, but they execute this much better than Kimber did while they were doing it. The Smith also uses an external extractor, but again, I'm sure they execute it very well.
To be honest, I'd say save a few more bucks and try and nab a Springfield TRP Operator. It may also be worth your while to look at Fuzion firearms as they make a very solid 1911 that is available with a rail.
