If you have decent density on top, and are keeping the sides and back short (you should be), try matrix biolage full density shampoo (although I can't use it any more it was great at adding fullness).
Then blow dry using cold air setting while also running a comb through your hair to fluff it up. I have let my hair grow out on top, about 3", while keeping the sides very close (fade comb-over like).
The effect is very good. Frankly, it looks much better then at any time when I was using styling pastes or mouse.