A Monk with 18 dex will have great AC; a Monk with 14 or 16 dex will have perfectly acceptable AC. A monk with 10 dex is assumed to be taking Mountain Stance, and will have as much AC as the Monk with 16 dex.
No, Monks have no direct need for wisdom unless you're planning on taking Ki Blast or Quivering Palm as they are the only ones that use your Ki Ability DC afaik.