I took Geodon for a while because I was also worried about weight issues. I don't have psychosis issues, so I can't comment on that, but it did help stabilize my mood and I didn't gain weight on that if that helps any, but it was almost too stimulating.
I'm currently on abilify, which seems to be a better fit for me. It's also generally weight neutral, just as an FYI, I couldn't tell from your post if you had a positive experience or not on it.