Obscuring mist seems reasonable. It is a level 1 spell, and its effect is not tied to caster level, so only its duration is affected...and it already lasts most of a fight. You can get it cheap for no problem.
Rather than having anyone prepare it in their slots, you can just keep it in a wrist mounted sheath for those moments when you need a 'ninja smoke pellet'.
Wand of Magic Missiles ensures your wizard doesn't run out of things to do and demand everyone stop the narrative for his sake.
Wand of Bless means you have it up for every combat. That's great early in your career.
Wand of Endure Elements will last you an entire campaign.
Wand of Mage Armor helps your monk for a couple of combats
Wand of Comprehend Languages will have enough charges to get you through some deciphering tasks.
I usually go with bless, mage armor, endure elements, magic missile.
mage armor is good for monks, animal companions, familiars, escort missions, or anyone who's sleeping.
I usually don't go with shield, it's a personal spell.
Here is a good resource on it.
Grease, because even though the save is low they are flatfooted when crossing it which is "Yay!!!" for the Rogues and those with sneak attacks.
