I think a spell focus feat is the safest bonus. The skill bonuses based on level seem a little powerful to me, although a single Free Skill Focus feat might work (although it seems a little weak compared to a Familiar). Other possibilites include
1) Ability to swap any prepared spell for a summon monster spell of the same level, or a divination spell, or some similar themed spell.
2) A bonus equal to 1/2 your level in one of the following skills: Craft(any), Knowledge(any), Spellcraft, or Use Magic Device.
3) Access to one clerical domain. These spells are added to your spell list. You get the spell for each level as a bonus spell that can be cast each day. You do not get the granted powers or abilites of the domain.
3) Energy resistance (type) = 1/2 your level.