The Occult Slayer capstone says it's a bonus to your Spell Resistance equal to your Constitution. Does anyone know if that stacks with the Drow racial Spell Resistance? Yes, I'd be giving up (compared to Half-orc) about +5 to hit/+7 to damage (more if you toss in Power Attack), but my conservative estimate of L20 Constitution, even for a drow, is 14 base + 6 item + 2 enhancement + 2 tome + 8 rage = 32. That, added to the drow SR of (10-16) + character level gives SR62-68 at level 20, which seems decently high.
Seeing as I'd be going Occult Slayer primarily for the purpose of shrugging off all the... er, bull leavings... that casters toss at me, it could be a fun build.
Are there any other easy sources of spell resistance that aren't quite so antithetical to the barbarian aesthetic as going drow?