Here is a list of the major brushes I use in my art (mostly Illustrations). These are Painter specific brushes (not Photoshop).
I'm pretty basic when it comes to painting. I haven't used any photo texture specific stuff yet. I have used an overall canvas texture to complete a few pieces, but apart from that I wield the normal painter brush for majority of things.
I work in Photoshop or Painter or both. I draw everything by hand traditionally and scan into the programs to work from there.
The brushes are the best things I've come across! I urge you to try/implement these awesome gems!