I have seen the Varanus in quite a few STFs. They seem to be quite popular with the KDF grinders. I usually fly the Vor'Cha Refit with my KDF tac, while I find myself flying the Raptor with my Orion Engineer. Both chzaracters have alomst all of the ships, but paring a tac in a cruiser, and an engieer in an escort seems to fulfill my needs. As for which ship to use, I suggest trying a few different ships and see how you feel. By the time you get to BG, you should already have a feel for the style of play. Granted by moving the starting level of a KDF player, that time period to try out differnt ships is drastically reduced.