Yeah Knock is a good one. Also, Dispel Magic, Haste, Expeditious retreat

Knock, Find Traps, several high level spells. Doesn't hurt to have some extra level 9 spells on-hand.

Utility spells are far better than Combat/Buff spells; unless they are super niche. The reason for this being that the default game's caster level for Combat/Buff spells cast from scrolls (and items in general) is at the minimum, with the lowest DC for offense, and lowest CL for the purposes of duration, MR penetration, and dispel checks. IIRC.

Things of this nature:
Endure Elements, Magic Weapon(Quickly loses value), (Dubious)True Strike, (Potions are more ubiquitous/universally useful)Invisibility, Knock, Resist Elements, (Better as uses/day item)See Invisibility, Ultravision, Clarity(Cleanse Ally), Find Traps, (Clouds)Gust of Wind, Keen Edge, Protection from Elements, Improved Invisibility, Lesser Spell Breach, Remove Blindness/Deafness, (Dubious)Remove Curse, (Minion, DRPen+5)Stoneskin, Energy Buffer, (SR:0 opponents)Bigby's Forceful Hand, (Dubious)Stone to Flesh, (Better as uses/day item)True Seeing, (Emergency)Shadow Shield, Spell Mantle(vs. Implosion), Greater Sanctuary, (if vault fixed)Black Blade of Disaster(requires proper training in it's nuances), (Emergency Utility) Shapechange, (Single Player) Time Stop