Steamrunner
The Steamrunner-class is an unconventional design with warp nacelles directly attacked to the saucer section.  The navigational deflector is located in a separate housing between the back ends of the nacelles.  The Steamrunner is obviously heavily armed.

The Steamrunner-class first appeared in "First Contact" and only exists as a CGI.  The registry of the Appalacia suggests that it is not among the most recent designs, although it looks quite modern and has several design features in common with the Sovereign-class, e.g. the hull plating and the escape pods.