Note that Spot is less important for a rogue/arti now, depending on your race, as there is an enhancement that can give you auto-search (ie. revealing traps as you walk past). There is a -4 search penalty when used this way, but you should always keep your search maxed out in any case so you won't notice unless you're doing elite.
Wisdom and charisma are dump stats for rogues, and you don't need high strength either if you're going dex based, as rapiers, daggers, shortswords and kukri can now take their attack and damage modifiers from dex (if you take Weapon Finesse and the Knife in the Darkness enhancement).