T_Smith,
To echo what has already been said above, there is NO need to look for a specialty 1911. I avoided 1911s for many years simply because I "knew" that they were essentially right-handed guns, based upon my experiences with them in the Army. In the end, I found that this faulty assertion just resulted in a lot of wasted time.
Once you have a quality ambidextrous safety fitted (like an Ed Brown unit), you will be amazed at how easy it really is for a southpaw to master this sidearm. I've gotten to the point where I much prefer to release magazines with my trigger finger, and I simply can't think of any other worthwhile incompatibility issues.*
The 1911 is surprisingly well-suited for left handed operation (especially considering the age of the basic design), and I suspect that if you went out and bought one tomorrow, you would soon reach the same conclusions. Buy with confidence!
Chuck
* Rosco is correct, however, in that some factory guns MAY have a very stiff mag release spring. Solution: buy the Wolff mag release spring set and use the strongest one that will still permit fast and reliable activation of the release by your left index finger. You may not even notice this phenomenon with a Kimber or a Wilson, but you probably will with a Colt (or perhaps even a Springfield). The idea is to have enough spring tension on the release to keep it from inadvertently ejecting the magazine when bumped, etc. I've only had one 1911 where this proved to be a problem (Colt Combat Commander), and after swapping out the springs, I've never encountered a problem.