First I would like to say that I am very happy that the Borg Probe now looks like the same ship from Voyager Episode "Dark Frontier".
I am also glad that the original probe design has made a reapperance as both the Regeneration and Tractor Probes(although, I would have named them after their geometic shape).
The Borg now have a frigate type (Probe), a Crusier type (Sphere), and a science type(Diamond), and two capital ships(Cube, and the Tactical Cube). It seems only reasonable that the collective has a small patrol/destoryer ship that would be sent to attack a particulaly difficult threat. The following are my suggestion: