Fud, a while back I looked into the 38 Super for the same reasons you are now, and I came to the conclusion that the only "magnum"-class ammo is the Cor-bon, everything else being pretty 9mm-ish.
The thing is, most manufacturers are, shall we say, "optimistic" when publishing velocities for their ammunition. I'm not saying Cor-bon does it, so far as I know they are a fine company, but it just seems to be a fact of life and more than coincidence that often the actual velocity from my guns isn't quite as high as published.
So, you have to ask yourself if the 38 Super would be worth it if, say velocity were to be 50 to 100 fps less than you expected. And for me, that answer was "no". Also, factory ammo in general just isn't easy to come by for this caliber, not being as popular as the trendy .357 Sig.
And of course you could reload, but that might not be a wise choice for self-defense purposes.
So how did I solve the "I want a .357 in a 1911" dilemma?
I said to heck with it and settled for a .45 Colt 1911. I reasoned that I'd rather bet my life on a .45, since it doesn't need anything "hot" to work well in combat.
Hope this helps!