Were it me, I might just go all ego all the time and let the entertainment come from the other party members giving me the business whenever I messed up.
Of course, it's just occurred to me you're probably listing the stats in the wrong order and not S-I-W-D-Co-Ch like they should be.
I looked at those numbers and thought "Int 18 with the rest of those stats to back it up - that's an ego looking for a place to call home!"
But if it's Dex 18 - I'd go with uber-Thief - a Locke Lamora type who gets out of trouble only slightly less often than he gets into it, and who always pushes the limits just a bit beyond where they break. A smooth elegant con man (the Cha 16 would really work here!) who can still look after himself in a fight.
Lan-"or I could trade you those stats for whatever I next roll up, if you want something more