JNG, I am not sufficently tech-savvy to post links (I know it's probably pathetically easy, but I don't have one of my sarcastic teenagers here to help me), but if you look at the Sovereign article in the Starship Database section of Ex Astris Scientia, at www.ex-astris-scientia.com,
they discussed the Nemesis changes there but gave no figures on new height.
Also, folks, per the cutaway posters (from 1993 on the Enterprise-D and 1996 on the Enterprise-E)...
Galaxy-class...464.25 meters long x 467.0 wide x 137.5 tall, and 397,805 tons (!)
Sovereign-class...685 meters long x 250 wide (214 across the nacelles) x 88 tall, and 3,205,000 tons.