If the setting allows it, you can go for a good Wizard with the Rainbow Servant prestige (although it's a weird religion). I can't remember the prerequisites, but at 10th level the prestige allow you to cast all the cleric spells at your current wizard caster level. You lose 4 spell levels, though, but can go on increasing wizard spell level after that and casting both wizard and cleric spells of any level (up to what your wizard can cast).
True, you start as a 11th caster level (can cast as a 15th with a feat), but as you level up (as wizard or wizard prestige) you can cast spells of lv 8 and 9 of both wizard and cleric.
Personally I prefer the power of 8th level spells and metamagic-altered spells.