To help me prioritize finances vs emotions in purchase decisions, I ask myself "What EXACTLY would I do with the rest of the money if I choose Option B?" If I'm more excited about Option B's outcome (think of it as an alternative purchase, even it's just the "purchase" of a bigger number on your spreadsheet), then I go that route. Otherwise, I choose the original Option A. Saving $Xk yields very little positive emotion in the abstract, but a quantifiable outcome gives the savings a meaningful purpose.
Thus, I get the privilege of including emotions and finances as much as I like without any negative baggage or future facepunching.
