If you've already founded your religion, then wouldn't it be better to get a permanent, significant bonus to missionary spread (GMoD)? Or there's Borobodur, 3 missionaries are worth 600 faith while a GP pre-enhance is only worth 300. I mean, I see how speeding up enhancing can help some (getting a better pick of beliefs) but still, I'd rather get a significant bonus to spread from either of the other 2 wonders.