Terminator 3: The Redemption likely diverges from Terminator 3: Rise of the Machines when the T-850 fights the T-X in the second-to-last fight (namely, in that the T-850 isn't reprogrammed to try and attack John and Kate, but sent forward to the future where Skynet won)...
@DaddyRomeo oh yeah, dunno when you plan to start your Dexter timeline, but been looking online, and apparently, the comics that Jeff Lindsay wrote are set in the continuity of the Novels.