You can also get one of two different IOs that convert knockback into knockdown, and turn Tornado into a giant chainsaw that rips through vast spawns. Also don't be shy about using the free respecs you get by levelling to 10, 20, 30 etc. You can safely make power and slotting choices that make sense for your current level range and then redo it once you cross whatever threshold you feel things get weird at. Playing /storm without Tornado and Lightning Storm isn't quite the same as playing it with those powers, after all. So that means you can experiment some with your primary choices as well and see what things work for your little team. A small, themed group doesn't always have the same priorities as regular teamwork, after all.