I took conserve power at 41....it's too good not to take. My attacks are Boxing, Scorch, BA, Burn, FSC, and Combustion. I'll probably take FE, Build Up, and Incinerate for the final three powers.
Really good guide, but it should be just that, as you play and get to know your character, you should come up with your own selections. I personally don't see the point of taking RotP.
I'm totally short on slots though...hehe