Here's my Monk that I hope would stand a chance against a Wizard: 20th level, 28 pt buy, 760,000 starting wealth (DMG pg 135).
Human Monk 20; HD 20d8+100 (average 193); Init +11; Spd 90', fly 60' (boots); AC 37 t 33, ff 30 (+7 Dex, +11 Wis, +4 class bonus, +1 luck, +4 bracers of armor)...