Deep conditioner for fine hair?

[Stringervest]

I have fine hair which has to be washed every two days or it is lifeless, greasy and flat. However, this means that it is also dry everywhere apart from the roots. I use Dove intensive repair conditioner on the ends but it's not cutting it. I need a deep conditioner or hair mask for occasional use which suits my hair type. Can anyone recommend anything?

I use the Michael Van Clarke Life Saver pre-wash treatment, and Hask conditioner (both silicone free). I have fine hair, but lots of it, and both are lovely for my hair.