There are a lot of great lines that fit your needs, I am also silicone and sulfate free at the moment and my scalp has been really happy! The ones that I have tried and really like are:
Living Proof Restore
Garnier Fructis Hair Foods
Shea Moisture Jamaican Black Castor Oil
Carina Organics Sweet Pea
Living Proof is a little more expensive but the others are just as good and at or below what you want to spend. Hopefully others will chime in with more options.
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