[Aerich]

IMO, 10 Int for a leader isn't that necessary, at least in the main game. You end up killing 98% of the NPCs you meet anyway. The halfling isn't a big deal to fight. If you really need a higher Int to deal with an NPC (Joril comes to mind), use a Genius potion for +4 Int; they are numerous and relatively cheap.

I think you can take off a point of Wis with no problems. Higher Wis gives bonuses to saves against spells that attack the mind, but 14 doesn't do anything.

But don't sweat it either way. A 17 Cha is plenty high enough to buy at cheap prices. You can also buy the Friends spell (from Orrick, I believe), which gives +5 Cha temporarily.

Your physical skills are much more important. I'd drain Int to maximize Dex and Con - I know I'm repeating myself, but that will pay bigger dividends that a higher Int, Cha, or Wis. Consider the proportions of encounters in the game. You only talk to maybe a tenth (conservative estimate) of the creatures, and many (most?) attack you on sight.