I very much like the 9x19 in a 1911 for fun and inexpensive shooting. I actually have two, a Trojan 5.0 and a Colt Series 80 Government Model. The Colt is a switch-barrel; it was originally chambered in 9x23.
Cool things about 9x19 in the 1911:
1) Very little recoil and wrist torque. I chose the 9x19 because my girlfriend is very bothered by recoil. She has had carpal tunnel syndrome (even had surgery) for quite some time, and the torque of a pistol under recoil is a big issue. The 1911 is really good for her.
2) With the fully supported barrel in the Trojan, 9mm +P+ is no problem to shoot. When I shoot the Trojan, I tend to use much hotter rounds than my girlfriend. When I want to shoot really hot loads, I (would) grab the Colt with the 9x23 barrel (which is at Tripp Research at the moment).
3) Great accuracy. I have shot several 1" groups at twenty-five yards with handloads.
4) Lots of fun.
5) Inexpensive Winchester Value-Packs. Great for the girlfriend to shoot.
If one is going to buy a 9mm 1911, I recommend the Trojan over the Springfield Armory. I had to wait about four weeks for STI to build my Trojan, but it is one heck of a pistol. Much better finish and attention to detail, and the STI barrel is great. I ordered mine with a Heinie rear sight, regular thickness grips, and a hard chrome finish. My Trojan has never failed with Metalform magazines. I think the Trojan is a great deal for what STI charges.