Styling tool for volume?

[Anotherlovelybitofsquirrel]

I have long fairly thick hair. I usually let it dry naturally which does with a very slight wave. I am after some volume though. Big hair, a bit of oomph! Not rollers, too much of a faff. Can anyone recommend something amazing please?

Oh yes, babyliss big hair. I love it and my hair looks like a salon blow dry when I use it.