I would start by completing all of the crit AAs and unlocking primal blasts.
Next move on to mana regen abilities, [EDIT: Spell Casting Mastery goes here] and, depending on your gear, you may need to unlock some stat caps with Enlightenment, Heroic Power, and Hidden Strength (HS doesn't apply to INT, bear that in mind).
Next I would make sure you have picked up Deflect, as it is one of the best wizard AAs and the only activated AA ability I actually use with any regularity. Sword pets are fun, but they are toys.
The non-fizzle AAs are pretty awesome, especially if you two-box, since fizzles cost mana and its nice to know that when you press a casting macro it's going to cast all the spells in it.
Next, especially if you plan on raiding, I would hit up resists in this order of importance: Magic>Fire>Cold>Disease>Poison, and then follow up with dodge AAs, any int/cha you didn't pick up before, then sta and agility.
Many people like quick gate and exodus, they are more useful than the other activated AAs but I waited a long time to get them and didn't feel like I was missing much.
You can do whatever is left in any order, although honestly you might be better served moving on to tomes at this point rather than getting melee attack AAs or any of the other activated abilities (Arcane Grip, Exodus, Manaburn, Lifefire are all situational at best, and pretty much useless at worst. note: not all wizards agree with me on this point).
