I haven't used conditioner in years. Interestingly, every time I get my hair cut, they tell me how healthy it is (well, that was before I lost it in chemo). I do have, and have always been lucky to have, a relatively full head of hair.
I'm not sure that volumizing shampoos really help too much. I do like John Freida's Brilliant Brunette volumizing. But, the shampoo that makes my hair the best right now is Herbal Essences volumizing shampoo.
Real Simple always has great suggestions on their site for different products for different hair types. They recommend a lot of leave in conditioners for people with fine/limp hair. I've never tried them personally.
The best way for me to get the style/volume I want is to dry it with a round brush. I know you're not currently drying it, but it may help with a light hairspray to keep the hair fromy flying around.