I know, but the Ethergaunt is going to be a Factotum, so I won't go too heavily into the class...
Max (and I think I'll maybe do that) 3 levels for BoB...
Also, I can't fit it into the build...
Be sure to look into psychosises as well. Not sure what dragon issue they're from offhand, but there's one that gives +4 Int and makes your sorcerer casting Int-based IIRC.
Riddled does too, but with a +6 Int...
Spellhoarding gives +2, but is too negative, and I din't really get it...
But there is many templates for Dragons that gives + to int
What do you think of giving Paragon to the Totemist BTW? And over how many levels in that case?