Enterprise E for me, particularly in its first two appearances, such a looker!
Also shout out to the new movie Enterprise (and some of the other fleet you briefly saw jumping to warp too, but NOT the Kelvin, man that thing was ugly, can't take non-symmetrical designs and the damn thing look like it was flying upside down!),
the Defiant and the Prometheus!
And when First Contact came out I was disappointed to see the Akira become the fan favourite ship as I had my eye on the Steamrunner during that battle, something about it I really liked.
Sadly you never saw much of it again because, as I said the Akira became the fan favourite ship and the producers of the other series latched onto this and featured it more heavily!