There are a few options. First of all, if you need to have 12 skills at max rank from level 1 on, Rogue is the only 8 +int skill class I know of that gets the social skills you probably need. I don't know of any means of getting +4 int by race/template to cover a 6+int class, at least not ones that wouldn't have an awful ECL. If it's ok to start with 6+ int skills and just crank up your int score, and you don't want Rogue, here are other options:
Bard
Pros: Large cha and social basis, with music and spells to bolster this.
Cons: Other than bardic knowledge, not much use for a very high int score. Raising int above cha to make up for skill points would be slightly suboptimal.
Factotem (Dungeonscape)
Pros: Only class that gets every skill as a class skill. Benefits heavily from a high int, arguably as much as a wizard does. Class features tend to be "add int to x." High int also allows you to take Font of Inspiration feat more frequently, a chain feat as important to the Factotem as Natural Spell is to Druids.
Cons: Only real con is not much cha-basis. Aside from taking cha skills and makingi t an important stat, it's almost a dump stat for the class (even wisdom affects opportunistic piety, at least).
Beguiler (PH2)
Pros: Only full casting option (limited spell list, though not any more limiting than say...a Bard's list). Int-based casting, so not unoptimized to max the hell out of int. Benefits gained from feinting in combat + social class skills make cha worthy o being high, second to int. Spells support social skill set.
Cons: ....None, really, other than having 6 + int skill points. I think the class is a little over the top, myself.