Soma, Jonathan Morris (Portrait of Ruin), Hector and Schneider could all use swords (even if Schneider doesn't count in canon).
That said, it's hard to pin an approximation of power in the whole series because each game has its own system of health, damage and whatnot.
I suppose though it would go without saying that Julius would have to be pretty strong to completely wipe Dracula out FOREVAR (regardless of his reincarnation as Soma, and of the fact that he had help from the Hakubas).
Dracula still gets my vote for most powerful, though. In fact, I think he's only ever been beaten three or four times while at full power (Trevor in 1476, Christopher in 1591, Quincey Morris in 1897 if you count the novel, and Julius in 1999)... I'd say Simon beat him at his full power, but the original game story conflicts with Chronicles about whether or not his resurrection was natural or the work of an evil cult.