Hmmm. What sort of equipment would be basic and useful to everyone... hmmmm....
Lets see. For basic competency across all classes you would need a VERY large variety of items to choose from. Not necessarily powerful stuff, but to preserve equivalency. Like a Druid set would be different than a Wizard set than a 2wf Rogue set than a Barbarian set...
You could put the sets together, after getting their character ideas and lists of 'what is most vital for your character to function'
Also don't remove the Wizard's spellbook...
I want to avoid customizing or tailoring anything to a specific class/race/type-of-character. But you bring up a solid point. I imagine the 'locker-room' would have something like:
+1 Silver Dagger ($2,322 gp)
+1 Silver Morningstar ($2,398 gp)
+1 Heavy Crossbow (with 40 silver bolts) ($2,354 gp)
+1 Silver Short Sword ($2,330 gp)
+1 Silver Longsword ($2,405 gp)
+1 Silver Glaive ($2,488 gp)
+1 Longbow (with 40 silver arrows) ($2,379 gp)
+2 Chain Shirt ($4,250 gp)
+2 Breastplate ($4,350 gp)
+2 Full-Plate with Armor Spikes ($5,250 gp)
+2 Heavy Steel Shield ($4,170 gp)
+2 Cloak of Resistance ($4,000 gp)
And they can choose any pairings of three. I want to include more items for spellcasters but there aren't too many that stay at a reasonable level (and have a CL of under 6 in their creation).
Also regarding a Wizard's spellbook, they would get to keep it...