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Unless you want to take epic dodge and/or self concealment feats, yes, the stronger builds work on increasing the sneak attack damage.
The feat can be added to items as a bonus feat but since it encompasses most of the class' unique strength most more balanced modules won't make that available.
Invisibility potions/spells are typically inferior to the hiding since they provoke an attack of opportunity, are vulnerable to the see invisibility magics and take longer to kick in. Improved invisibility is useful when cast before a combat as it gives a 50% concealment bonus.
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