All good firearms,try one out at local range which rents,,
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To meet most of your stated requirements in your OP, these are some that come to mind.
Colt Lightweight Commander
Most of the Kimber Pro models have aluminum frames
A used Dan Wesson Guardian has aluminum frame
Springfield LW Champion
ETA: S&W E Series guns Model SW1911Sc E-Series™, Round Butt, Scandium Frame
SIG has several Aluminum framed Commanders but I forget it's name RCS Nitron
For $1,500 you could possibly find a used Fusion Firearms semi custom built Commander with a aluminum frame.
As someone who has owned and carried several 4" 1911 models with the bull barrels, I much prefer the true Commander length guns with a bushing and GI spring set up instead of a FLGR. Ease of take down is the reason (no tools needed). YMMV
JRolin:809172 said:Thanks for all the input.
I think I have it narrowed down to 2 models.
1) Kimber Super Carry Pro http://www.kimberamerica.com/1911/super-carry/super-carry-pro
2) S&W E1911SC http://www.smith-wesson.com/webapp/...70151_757752_757751_ProductDisplayErrorView_Y
Any other models I missed ? Im liking the rounded butt feature.
Any reason to chose one over the other ?