The Colts are hard to find like you said. I waited all last year for one but ended up getting an Uberti Smoke Wagon. In my area they are easy to find in .45c and .357 caliber. The Rugers are also easy to find and they were all over gunbroker the last time I looked.
You might want to price .45c ammo before you buy. That is what got me into buying reloading gear. I found primers today, last box on the shelf. All I need now is brass and I can make my 1st $1000 dollar bullet.