1. Charm Person - endless roleplaying possibilities, and may save you some pointless encounters.
2. Hideous Laughter - besides being hilarious, this simple spell can win you fights against very tough brute monsters.
3. Suggestion - let them do whatever you want, and they'll even think it's their idea! Hours/level, too.
4. Charm Monster - you now have a permanent pet. Oh, right, days/level only, but it's not as if you couldn't re-cast it whenever you feel like it.
5. Feeblemind - I just like the effect. Can shut down arcane casters HARD: with a -4 to their save, a strong Will save doesn't help much, since Wis will likely be dumped.
6. Freezing Glance - rather unusual Enchantment spell, and just great for shutting down multiple targets while still doing something else.
7. Power Word, Blind - yeah, a good power word spell! The 200 HP cap is actually OK, I think: you won't get dragons, but will get a lot of other monsters, as well as most NPCs at this level.
8. Irresistible Dance - I like no save spells. I really do. Also, just great fun visually.
9. Dominate Monster - much too high in level for my taste, but still a useful spell to pick up a powerful-but-dumb bodyguard.