In addition to Colt, Springfield and STI, I believe Sig makes a 38 Super but I'm not sure Glock does, although they may have/do.
Yes, the 40 S&W makes a bigger wound channel than the 9mm, most 9mms that is, but we ain't talkin' 9mms, we're talking 38 Supers and there is a noticeable difference betwixt the two. The 38 Super is a handloaders dream, not so with the 40 S&W. The comparison is similar to the 38 Spl/357, the 40 S&W/10mm, the 308/30-06 or chevies and fords, but ammunition is plentiful - just order it the same way you would order 9mm. Someone is always gonna tellya that such and such is better or that you can do just as well with one and there is no need for the other, heavier caliber. I regularly handload my 38 Supers to 357 Sig velocities with 125 gn bullets and can get almost 357 factory velocities with 158-160 gn cast slugs (i.e., most factory 357s used to send a 158 gn slug out a 4" bbl at 1250'/sec - the 38 Super can send it out at almost 1200'/sec and you usually have at least 3 if not 4 more rounds to do the job with).
The one 9mm load police agencies stay with is the Remington +P+ - it takes a 115 gn hp at nearly 1220'/sec and it rarely takes two shots to stop someone. The 38 Super drops a 125 gn hp out the barrel at a bit better than that. The Illinois State Police were going to adopt the 38 Super to replace their 357 magnums but found that round to still be too powerful for regular police work (over penetration, etc).
Does the 38 Super work - oh yeah, it works. It worked on jaguar for me in South America and evn brought down a few small deer with chest shots. It is more than adequate for small game. It is absolutely more than adequate for personal protection. You can even get the 38 Super in Commander sized packages.
However, you can get nearly as much variability with the 357 sig, almost - I say that because I don't yet know if anyone is reloading that cailber with the same heavier slugs you can push from a 38 Super. The 40 S&W is still a 40 short and weak - it needs fairly high pressures to get that short fat slug to move at any decent velocity.
40 S&W reloads can be tricky - as I've mentioned, they are high pressure rounds and there are more than a few stories out there about 40s that go kaboom with reloads.
With a 1911 in 10mm/40 S&W, you can rebarrel quickly to 357 Sig or slip on a different top-end for 38 Super/9mm. I think STI makes a 1911 with a slide that is set up to take a number of different calibers.
I would opt for the greatest variability I could find. HTH. Mikey.