On a side note, crossbows arent that horrible, as long as you are a sneak attacker. Get the Crossbow Sniper feat from PHB and the Rapid Reload feat from PHB. The former doubles your sneak attack damage and gives you a tiny damage bonus, while the latter allows you to reload as a free action, which will be golden later on. My Van Helsing is a tad rusty, but didn't he dual wield crossbows? I remember tbat he was able to put out a significant volume of fire, so perhaps he were. If you decide to go that way, the Hand Crossbow Focus feat from PHB2 counts as both Weapon Focus and Rapid Reload, but for hand crossbows only. Never ever use repeating crossbows as weapons! They suck!
If you are allowed a rebuild, I suggest that you take 3 levels of rouge first because you get x4 skill points at level 1, and then proceed to go fighter and possibly assasin as Solo said.