Those are all good PrCs. Depending on the deities you have available, getting one with the War domain and a good two-handed weapon (like a greatsword, greataxe, or falchion) is a good boost for an offensive cleric. You can get a pretty good Str score with a persistant Divine Power running. That also boosts your BAB and makes Power Attack a viable (and important) option.
As for ability scores with the point buy you have, I'd recommend something like this for your starting stats:
Str: 14
Dex: 14
Con: 14
Int: 8
Wis: 16
Cha: 8
You could toy around with the Dex, Int, and Cha a bit depending on your needs (as these are the three least important abilities). You don't really need much of a Cha score, as each persistant spell will cost you 7 turn attempts. Given your two Extra Turning feats (+8 attempts), and the three you start with, you have 11. You'd need at least a 16 in your Cha to get enough turn attempts to let you persist two spells per day. I don't think it's worth blowing ten points of your point buy. If you can buy some nightsticks (not too costly for an 11th level character), I'd say buy one or two and dump your Cha score. If you buy two, you can free up one of those Extra Turning feats too.
