Wow, kinda beefy, with 3 more tubes than the Sovereign. Overall I like the idea but I think making the saucer warp capable is a little much. Are there going to be extra nacelles sticking out of the saucer? Unless you're trying to make another Prometheus-class, I would leave it impulse-capable, otherwise it seems like you're trying to fit too much into one package.
As to the variant, how about just calling it a Heavy Dreadnought?
BTW, dibs on the USS Indiana!