I only know that all non par or odd number versions from Adobe pack are too buggy like they wrote software for the first time.
eg. Illustrator 5, 7, 9, cs1 and cs 3
also photoshop 5 (5.5 version is OK), 7, 9 and CS 1 (I don try CS3 but I think it was screwed to because CS4 is for now)
From this validity and if I buy new Mac (it only depends if my old will bee dead) I will wait CS 6 version.
For now CS2 is OK.