Voadam said:Another option is to go the "divine casters are spontaneous casters as well" option in Unearthed Arcana. Clerics and druids have spells known like sorcerers plus domain spells and summon nature's ally. They use their current number of slots +1/level but no divine slot for clerics.
It is real easy to implement and adopt and allows you to use any sourcebook you want and keep it balanced (if the spells are) and manageable.
Rangers and Paladins get so few spells and so rarely use them that it has not been a big factor in our games.

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.