The DMG (p225) has the Holy enchantment listed as costing a +2 enchantment.
The MIC (p36) has the Holy Surge enchantment as costing just a +1 enchantment, and says:
A holy surge weapon functions as a holy weapon (DMG 225). In addition... (it does other cool stuff)
Am I correct in reading that Holy Surge costs less than Holy and does more? If not, what am I missing?