Yeah Dave, Bulleit Rye is the insane good!
So my pick of choice is the Brain Pick 1.14mm for acoustic. These picks cling to your fingers instead of having to pinch them so hard. I like the thickness because I'm usually leading 3-4 guitar players in a sing-along setting, thinner picks flex too much when I have to push them.
I did a scientific analysis with all the different picks I own; this involved a couple of ice cold beers, my two Guild acoustics, and my astute hearing abilities.
I tried the following types: Ivory, Brass, Wood, Tortex, Bone, Steel, Nylon, Quartz, and Silver, probably some other plastics, all picks I've collected over the years.
The best sound in my opinion: Nylon. Dunlops, Brains, etc.
I also love my Mojo silver pick, made from a US solid silver Quarter from my birth year, 1954. (Boy I wish I'd bought more of these when they were like $8.) This is my favorite pick on my electric guitar, but it is also really nice on the acoustics. I swear the physical properties of the silver change after it's been warmed between your thumb and finger for awhile and this also affects the tone. I love the way it reacts with the wound strings.