Personally, I like the Infusium 23 conditioner.
You know, conditioners are tough to call. I too have very dry hair, but when I used some 'moisturizing' conditioners, they made my hair kind of curly and some of them made my hair feel even drier. I learned through process of experimentation and elimination that my hair shafts do not respond well to buildup, which a lot of moisturizing conditioners can sometimes leave. I actually discovered this when I described my situation to my hairstylist, and he suggested using an occasional buildup remover, and a lighter conditioner.
Well, the buildup remover worked fantastically! But, beyond that point, despite the fact that my hair is naturally somewhat dry, the lighter Infusium conditoner works extremely well for my hair. (and thanks to Cassin for that recommendation! Even though he may not use it anymore and may have found a conditioner that works better for him, when he suggested I give it a try, I fell in love with it.) My point being that finding the 'right' conditioner is often times a matter of experimenting with several before finding one that works really well for your hair type in particular. Broad labels such as moisturizing or thickening or 'light conditioning' do not necessarily mean they will address your perception of what you think you need as a conditioner.
The products all referred here by the previous posters are all outstanding, but you may have to do some hunting and experimenting on your own until you find one you really like.