I'm still also undecided on what I should add to the party. My original ranger 4/bloodhound 1/occult slayer 5 fits with the campaign and makes me party leader, and gives me nice mental immunities. I also have good tracking skills, gather info, can cause flanking with my arrows (and have reasonable bonuses on my damage, though nothing fantastic). I will probably dump Cha in this build though.
On the other hand I could do a Cha monkey build with Paladin/XYZ/Witch Slayer5, which brings fewer skills to the table and is a more self centered build, but it gives me that awesome off-switch that can turn off casters (the Witch Slayer's capstone ability). The downside is that the off-switch doesn't really improve beyond ecl10, so while it'll be great at the beginning of the game, it loses its lustre later on.