I have a couple of the Lee molds and they work fine with my ACP, and my 45 Colt. I see your concern on having to size, and this is valid as I had the same when I started out.
That said, I use the Lee push through sizers which are only around $20 per caliber, and they do a fine enough job for me to get 2" or so groups or less at 25yds offhand from most of my cast loads.
Also when you pick up the Lee sizer kit, you will get a bottle of the Lee Alox. This has also worked for all of my cast loading needs as well. I do however blend it into a mix known as 45/45/10, which can be found over on Castboolits under the "Tumble Lubing Made Easy" thread.
Mike / TX