I suppose I should put up a quick note. I'm kind of shying away from Radiant Servant of Pelor because, well, it doesn't exactly mesh with the Bone Knight concept, and because the warlocks most recent previous character was a Radiant Servant of Pelor cleric. So for the same reason I'm avoiding druid I would like to avoid RSoP. That, and ya know, worshiping Pelor... When I've actually got some fun brain storming with a friend of mind creating the country and religion this bone knight comes from (such as his armor and equipment being forged from the bones of a dracolitch to enhance his necromatic power, I don't suppose there's an armor enchantment that would give a mechanical bonus to this fluff?).
Edit (Big): Alright, so I think I'm just going to go with a somewhat simple Cleric 3/Church Inquisitor 3/Bone Knight 2 build, taking the Apprentice feat with the soldier archetype refluffed to have Riding rather than knowledge (local) and calling it knight.
This makes the character's stats (using rolled ones)..!
Human
Str 16, Dex 12, Con 15, Int 16, Wis 20, Cha 17
BAB: +5, Fort 9, Ref 2, Will 6
Domains: Planning, Undead (or Deathbound and Undead), Inquisition (traded for Knowledge Devotion)
Feats: B) Knowledge Devotion, B) Extra Turning, B) MM: Extend, 1) Persist, Apprentice, 3) DMM: Persist, 6) Practiced Caster/Power Attack?
Casting as a level 7 Cleric
Rebuke Undead 10 times per day, Detect Evil, Immune to Charms, Pierce Illusions, Bonecraft Armor, Bone March, Summon Skeletal Steed
Skill Ranks: 74
Concentration 11, Craft: Armorsmithing 6, Craft: Weaponsmithing 6, Riding: 6, Spellcraft 11, Knowledge: Religion 9, Knowledge: Arcane 9, Knowledge: The Planes 8, Knowledge: Nature 8
I know the intelligence is high, but this will give me 6 skill points/level in the Cleric and Bone Knight levels to continue advancing his knowledge skills - which is really needed since no one currently in the party has knowledge skills. I like the strength of 16 since with Divine Power this would boost it to 22 Str, a +6 mod which would give +9 damage with his greatsword.
Now assuming no one can find a way to optimize the above, I'm a bit lost on what to spend my huge pile of gold on. Standard WBL rules, so 27,000g. I believe my DM will ok him starting with a bonecraft weapon, and just not get the extra damage against living targets until he gets the ability.
Items of note I'm thinking of grabbing: +1 Animate Heavy Shield (9,000g), +1 Bonecraft Greatsword (2,000g), +1 Bonecraft Full Plate (1,000g), Fortifying Bedroll (3,000g). This would burn up 15,000g already, and adding a Nightstick would strain that to 22,000g. I'm wondering if the 4,000g for a +2 wisdom item is worth it or if I should just burn the rebuke attempts on persisting owl's wisdom for a +4 total mod. I know there's a holy symbol which add rebuke/turn attempts per day? I'm not sure how much gold or where its located, but it'd probably replace the first nightstick.
Also, assuming I can get 14 turn/rebuke attempts per day (by picking up a night stick), I'd be able to persist four spells per day (persisting two, then sleeping for an hour, then persisting another two). Lets persist 3 so that I have some rebuke attempts left over in case I need to expand my undead army. Spells to persist would be: Recitation (group buff), Divine Power (self buff), and likely some third level spell or other good party buff.