Where's a good place to dump Cantina energy? Also, what chars have shards at higher levels?

Getting a crew.."the crew" the perfect crew will never happen. They will constantly be adding new characters which will change the whole landscape of balance by creating or completing different synergies within teams. The game will be ever evolving until its no longer profitable. Which judging by there system of IAP's they are raking in some dough.

Its best to get a crew you enjoy playing regardless if they are the very best team or not and take next month or so and just grind to 60. I truly believe things will balance out there.