Well if you're planning on playing with jenners you pretty much only have 2 viable build choices, so it's not that hard haha. If you still haven't decided what you like to do then your choices continue to change with each new mech.
Did anything change as far as gameplay balance issues? I haven't tried to reinstall again after the last few times, so I haven't been able to get back in game.
I only plan on running a Jenner when we pre-made since we can gameplan around our composition. Outside of that I'll be in a Heavy until the Clans arrive and I can get my troll on in a Stormcrow if they include that mech with the Clans.
Theres only like a million page long thread on their forums about Clan mechs and weapons. They want community feedback on what the players feel would be fair balance. We all know if they have Clan tech as powerful as it is in the lore when they arrive in the IS, it's going to be game breaking.