I acutally looked at Occult Slayer earlier today and found it...incredibly underwhelming. Most of what it grants is out-done by Warforged Juggernaut and/or divinity.
Same, a lot of hype about it but it at best gives free action Mind Blank and +3 to saves. You have to add in Mageslayer to prevent spellcaster from casting defensivly then you still have to deal with 5ft steps, intimidate action teleportation, etc. So not worth it.
Paladin is likewise unusable (all variants require no neutral alignment components), unfortunately. Right now I'm looking over Incarnate, Totemist, and Binder, though. I figure something in there might be of intrest.
Other than Master of 9, are there any interesting PrC's that I should look at? War Hulk and Hulking Hurler are tentative at best.
Crimson Scourge 8 gives immunity to nonlethal damage, combine with regeneration to become immune to most forms of damage.
Iaijitsu Master is another prime noncaster PrC. It gives charisma to initiative, at level five your iaijitsu strikes deal an extra charisma modifier
per die in damage. A full 10 levels would even let you gain a free surprise round that expressly lets you make a single attack with a Kitana so long as you are in melee range.
And lastly. Warshaper. Helps to be Changling over Warforged but I'm sure it can be done some how, and probably in a way that gives Regeneration. Mindful the +5 feet of reach applies regardless of form you take meaning you can be Fine sized and not have to move onto another's square to attack. Would be hilarious to see something the size of a pen Dungeoncrashing Colossal creatures around (there is even a +25 divine ability you can take too).
