I have the PG500. I stopped using my SM025. I do everything the PG500 including cheese, almonds, fish, beef, pork, chicken.
Like cal said, pellet cooking is the best. I use 100% hickory and 100% cherry. 50/50. I live in Southern California and have no need for the PG1000. If I was to buy another one, I would get a PG500. Right now I have my eye on a FEC-100.
I am available by PM too if you have any questions.