If you're just interested in getting out, you should be able to do the following:
*** MAJOR SPOILERS ***
Follow Ares' advice. Once you've met the large, "friendly NPC" he refers to, go back to the large doors in the Kuo-Toa lair. You can buy your way past the drow guards (though there is a fight on the other side of the doors). From there, it's only steps to the exit from the underdark. The only problem is that, if you do this, you'll be able to re-enter the underdark, but you'll _never_ be able to get into Ust Natha (thus missing an excellent portion of the game).
You may want to stick around and finish the underdark instead of leaving, because it sounds like you've done a lot of the more difficult quests. If I were you, I'd follow Ares' advise, then go to Ust Natha (just my 2 cents).
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Do not meddle in the affairs of wizards, for they are subtle and quick to anger.
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