Tresemme naturals is a good one. I also have very long hair and this didnt weigh it down. However if you clarify what exactly you want to use it for (cowash, rinse out, or leave in) and include your hair properties you will get better recommendations

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This website will walk you through hair properties: texture, porosity...

HTH
3a/3b, Low porosity, Medium Density
Low-poo: Shea Moisture Moisture Retention
RO: Matrix Biolage Conditioning Balm
Leave-in: Kinky-Curly Knot Today
Styler: Aussie Instant Freeze or LALSG