I would like to join in on that too but the time zone differences would just screw me over, so... ah well :P
I've been playing more Singed lately. Had a streak of luck with my games where I had a positive ratio at the end of each game except one, winning each one. Feels good feels good ^~^ I'm going to be playing more Yorick as well sometime soonish. Gonna do my best to master the top lane.
Because of that I'll be getting more champions and I'm wondering which of the following you guys think I should get: Riven, Jayce, or Shen?
Jayce, Riven is a close second. They both are very strong champions.
Shen is often banned and it's relatively hard to make him work with random people. You would learn a lot though by playing him, on a personnal level, as using his ult and split pushing are important things to learn (though you may know a lot about this already).
I would advise getting them all for one reason: learning. Even if you don't like any of the 3, you'll still have learned their pros/cons from the other side, their cooldowns will be more familiar when you play against them (tracking Riven's stun, Shen's shield, Jayce's gate).
The sale is good but I don't own most of the champions :( (And the ones I own, I already have their skin).