From Gravity, you can probably skip Lift or Crush (each has its dis/advantages) as well as Dimension Shift (unless you really like AoE phase powers). Propel has nice damage with Containment but becomes less and less useful in higher levels.
From Sonic, you can probably skip Sonic Cage (same as above, but single-target), Sonic Repulsion and even Liquefy (some people like it, I don't). Disruption Field is not a must-have if you solo a lot, but I found it very handy (especially now that it doesn't draw all the aggro to you 
).
Grav/Sonic is a good debuffing/mezzing combo (although the synergy is not always the best), but can be very frustrating to solo, so make sure you find teams and slot lots of EndRdx in those toggles.
CoX 50s: <ill/rad> <ice/ice> <fire/kin> <grav/sonic> <ice/storm> <earth/kin> <kin/elec> <cold/psy> <thugs/dark> <fire/dark> <dark/elec> <night widow> <EM/ninj> <mind/icy>
thanks for that its somthing to get on with . ive missed the powers you mention .i dont think making bads un hittable is a waste of time.
thanks again.
Kin Hell Fire
Barline
Bibbi.
Slushy Kins
Nuria Dark
I agree, but you know what can happen with phase powers and bad teams... At least now the animations are much more visible, but it will still annoy some people when you use them.
CoX 50s: <ill/rad> <ice/ice> <fire/kin> <grav/sonic> <ice/storm> <earth/kin> <kin/elec> <cold/psy> <thugs/dark> <fire/dark> <dark/elec> <night widow> <EM/ninj> <mind/icy>
bit of a typo there i ment to type i do think they are a waste of time. from experence they get on most peoples nerves.
Kin Hell Fire
Barline
Bibbi.
Slushy Kins
Nuria Dark
ive made myself a grav sonic troller and need some advice on powers to take and miss.
slotting will be geared towards holding and debuffing and buffing rather than damage so i kinda no wat to do there..
thanks
Kin Hell Fire
Barline
Bibbi.
Slushy Kins
Nuria Dark