I was in the same boat as you, I have Kimber .45 ACP (still series II) from early 2000s.
I wanted something different and went with a Colt 9mm Competition.
Things I like about it are
-Cheap ammo with 9mm and almost no recoil making fast follow up shots
-Accurate. If I concentrate it is not very hard to produce 10-shot one hole groups at 7 yds. I'm sure the gun can do one hole group at 10+ yards but I can't.
. I believe it comes with a NM barrel.
-Series 70 since it is competition series.
-10 shot capacity (with Wilson mags)
-Undercut trigger allows higher grip
-Reliable. I shot over 1,000 rounds since buying it in last November and the only failure I had so far was that 1st round failed to go into battery from a fresh mag - I'm guessing I loaded that incorrectly
I'm not a huge fan of the fiber optic front sight as it is a bit wide but it can be replaced.
I like the simplicity of this pistol so much I'm thinking about buying it in the .45 ACP as well, even though I already have the Kimber for that.