I have a 45-50k DPS build for the Tarantula. It is running a A2B setup.
I used to run the full Iconian 4 Piece but since I am running an A2B build, i chose the spire warp core for the [W > A] feature. Not sure if its worth using the Romulan Impulse engine for the attack pattern boost.
For Doffs see my description on the build link.
This is generally what I have to work with in terms of extra gear: http://i.imgur.com/cX112gn.png