Devs - yes you made some changes and myself along with many others thank you for that. That being said I still have an issue with the enhancement system and before I start I will say I am being somewhat selfish in this request.
What I would like to see is that you don't differentiate between Paladin Turn Undead Enhancements and Cleric Turn Undead Enhancements particularly Improved Turning and Extra Turning. As it stands now, as it was in the past with skills, these enhancements are mutually exclusive. Similar to skills this doesn't make much sense since both classes call upon divine powers (the same divine powers) for these abilities. These should be treated exactly the same way skills are now.
To further with the build I would like to implement...I want to multiclass a cleric using Radiant Servant and paladin Hunter of the Dead. These two prestige classes have perfect synergy between both healing and the destruction of undead. However, under the current enhancement system you can't take both! You are tripped up over the fact that both require Improved Turning from their respective class and as I stated previously you can't take both.
Granted I could use a different paladin PrE but I don't feel either has the same synergy that the HotD PrE does or offer the best options for the character build I'm trying to achieve. In fact, in order to use Knight of the Chalice you even have to give up some of the characters spell casting ability since that PrE requires the paladin Engergy Line (Spell Points) Enhancment. That is a huge trade off when the primary class is cleric and not one I feel works well for the build. Therefore, the only choice is the Defender of Siberys prestige. I have nothing against DOS and it could possible work for a build but if I was just looking to make an AC cleric I would be better off multiclassing fighter to get the Stalwart Defender line and the extra feats.
I think you really need to take another look at the PrEs and the Enhancements. Some that should work together can't under the current system and that is a shame. Please just review these issues in the future and please clearly plan out the system so that issues like this don't occur.