Runzel, you may want to check out these sites for ideas on ingredients to make the thick+creamy+slippery conditioners you are looking for.

MyHoneyChild conditioners

Karen's Body Beautiful

From MHC, I've used the HoneyBerry Conditioner and like it.
From KBB, I've used samples of the Hair Milk and Hair Nectar. They are both great products; the Hair Nectar is much more moisturizing.

Both of these lines have quite a following at naturallycurly.com, especially KBB.