I would go with DM/Inv or WP brute (DM has that fear factor and brutes are sturdy like vampires and theres a drain life power in DM as well) with super speed, stealth pool including phase shift, fitness, and maybe fly or jump depending on what vampire or vampire form you are. Patron powers likely would be soul mastery ofcourse.
There are so many kinds of vampires and ways in which vampires are portrayed, in print and on film, that there are tons of combos you could put together to be "vampiric".
I have a vampire concept who is a Dark/kin/Ghost Widow corr that flies and has stealth. FS'd Moonbeam is so fun!