"Standing desks and chaise longues are good options. Ball chairs, which bounce your spine into a C-shape, are not."
A ball chair is not an exercise ball chair. Looking at the illustration on Wikipedia, it's clear that a ball chair forces a C-shaped spine. Your spine will stay in an S-shape if you sit upright on the "chair" I'm referring to.
http://images.businessweek.com/mz/10/19/0509_chairs.pdf
I'm just going to continue as usual, using the ball chair and alternating with a normal chair if needed. My spine feels great and definitely has a more natural shape when sitting on the ball vs. a normal chair.