I understand you want to keep costs down, believe me, but it is definitely worth the money. It basically rewrites the whole magic system and base classes, removes alignment game mechanic completely, yet retains the DnD feel. If you lived in Iowa I would let you take a look at mine.
If you just want to limit power of the Cleric however this is what I would do. Remove the Medium and Heavy armor proficiencies, drop them to a d6 Hit Die, and scale domain abilities, but allow more of them. 1st level they gain 1 domain access, 8th level, they gain a second, and at 16th gain a third.
Keep everything else the same.