I'm not the best person to comment on the power of the build (seems good in the end but kind of guessing with gear and such), but are you planning to level in this order? Barb 3 -> Pal 8 -> Sorc 1? If so you won't get an extra attack until char level 8. I'm not sure what the optimal order is for multiclassing organically though. Probably makes more sense to be single class something until higher level then respec.
Edit: The Great Old One does not give +HP on kill, that's The Fiend...
The leveling order is not set in stone but Sorc L1 will most likely be at L2 because I want to be able to be ta face of the grupp fast
