Forum:My Class Plan (NO SPOILERS!)

So with ME3 out on Friday I was doing a pre-game class plan for the soldier class but I'm unsure what rank choices to choose, not having played at a high level, especially with the 6th rank of Combat Mastery (either +50 carry weight OR + 10% weapon dmg and +40% ammo pwr dmg). My first choice was more damage but after playing the demo many good weapons are really heavy. So I was hoping that some of you lucky Americans could give me you views on which is a better choice after having played the game. Also is there a way to redo your power choices like there is in ME2?

P.S. PLEASE AVOID STORY/ CHARACTER/ LEVEL SPECIFIC ETC. SPOILERS. I'm already avoiding all the wiki's articles and most other things related to ME3 so I don't think its to much to ask to keep this forum post spoiler free. Please =)