Hands down my favorite 45 Auto and .38 Special powder is W231/HP-38. If I can't find W231 I do have a few alternates I feel are acceptable. You can safely use probably 40% or more of the handgun powders available today in the 45 Auto. Some will produce better results than others but a lot will work.
Like I said, W231/HP-38 is my favorite but you can also use, AutoComp, WST, Clays, Titegroup, Universal, 700X, PB, SR 7625, Red Dot, Green Dot, Promo, Unique, Bullseye, AA#2, AA#5 and Zip. You can even use HS-6, True Blue, Power Pistol and a few others in a pinch even though I think they are too slow for the 45 Auto. Of the 15 to 20 powders I listed above I'm sure you will be able to find a few you like. Of the above list Zip would be my first alternative to W231 and AA#5 after that. (AA#5 was developed around the 45 Auto)