To determine if purchasing a unit at 838 Hougang Central #xx-xx for $60,000 above valuation is worth it, consider the current market value of similar units. Recent transactions for 5-room units in this block range from $750,000 to $785,000. If the unit's valuation is $770,000, the purchase price would be $830,000. Factors like unit condition, floor plan, view, renovations, market conditions, and proximity to amenities should be considered.