Keep in mind the difference between an all steel commander and an alloy-framed commander is about 3.5 ounces. Not really much difference all. Plus you get quite a bit of recoil with a 45acp lightweight gun.
I just picked up a brand new Colt Commander LW in 9mm. I really love this gun! I put 160 rounds through it when I picked it up last week. I also really like the polished blue finish on the flats of the slide. If you get the all steel version, it has polished blue finish on the flats of the frame as well.
Here is one of the first few groups I shot with the basic 115gr Federal Brass ammo I buy lots of at Walmart:
Here is a group I fired with Federal 124gr HST, my carry load. That's 10 rounds in the target below! 8 rounds in that little cluster in the center. Accurate enough for you? I can't do that with 45acp because of the much stronger recoil. It would take me a lot longer to shoot a group like that with 45acp.
Aside from the nice polished blue finish, another major of the reason I went with Colt over Springfield or Kimber are the quality of the parts Colt uses. Only 4 parts on the Colt are MIM. The less expensive Kimber and Springfield's are chock full of MIM parts. Actually nothing wrong with MIM parts if they are made well. But MIM parts on 1911s seem to be hit or miss based on who makes them or where they are sourced. If figure the less MIM parts the less chances I am taking.