Take /storm if you want an easy piece of ghetto control. The AoE immob from gravity won't stop the knockdown from Freezing Rain like the immobs from other sets. Slap them both on a mob and there's not a lot they can do to you.
We need more Grav/Rads around. Check the thread and join the fun.
Grav/Storm have great synchro together with Non-rooting immob and Freezing Rain.
Kinetics is never bad, neither is Empathy.
[b][color=blue]Coldest War /[color=red]/ Omega Patient[/b]
[url="http://www.the-cow.net/"][color=red]The CoW Network (Blog) /[/url][url="http://www.collegeofwar.com/"][color=blue]/ College of War[/url]
FF suits thematically, storm provides synergy, control, and great physics.
I'd say storm or rad. Or sonic if you want a real challenge... 
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>
I'm starting a Grav troller. Just can't figure out the secondary. All I know is that I wont take Empathy or Kinetics. Any tips?
PS: I'm not a pvper :P
@False Fiction - Virtue / Defiant
Current projects - [Glaciologist - Ill/Cold Troller] [Cloudshaper - Storm/Dark Def] [Harald Wartooth - Elec/Psi Domi]