What level will my recruited NPCs be? ( and who should I recruit ...)

So I've hit 5 cleric/4 wizard on my current no-reload game and I'm wondering if I should start recruiting yet.

I haven't touched anyone except Imoen.

Will I get level 4 NPCs due to wizard levels?
5 due to cleric?
6 due to combined XP?

Away from the factual stuff ... Any ideas on who would mesh well with my shorty caster?
I'm thinking:
Imoen thief/wizard specialising in traps (though maybe safana is a better bet XP wise?)
Coran (with OL)
Yeslick
...
That's all I got. Seems well covered but 2 slots is a bit much for covering NPC quests.