Well, I'm not a PVP player myself, but I know citizens who like to go hunting with the F8C. But that may have changed in the meantime - I don't have any experience.
Polaris: nice ship, but very expensive (torpedoes!) and hardly practical to use. The hangar is meh, otherwise only usable in a fleet. As far as I've heard, Vanguard ships haven't been usable for some time now because CIG has nerfed them down to their skeletons.
All in all, as I wrote, a matter of personal priorities. Perseus, however, will certainly be an exciting ship, much more useful (in my eyes) than the Polaris (which in turn comes from my own experience in fleet gameplay together with/against Idris). In this respect, Naff has certainly done everything right.
