Which battle do I fight?

I was just on compassion's website looking at all the children not sponsored. There are so many of them! My heart always breaks becaue I look at each child and I see how special they are and how much love they could use in their life. I'd love to sponsor them all but logically I know it would be impossible for me to sponsor every single child that was in poverty.

So, I started thinking about the future. I finish law school in a year and a half. I always have said I want to be a prosecutor because they put people in jail and speak for the victims when the victims can't. To me that is a noble profession where I can do good in this world. The problem with that profession is that thanks to the state of the economy the pay is not there. The starting pay isn't terrible and it's enough to live on but when I factor in taxes, paying back student loans, mortgage, possible kids, retirement, etc. it leaves little left to give. My back-up plan if I can't find a job as a prosecutor is to be a trust and estates lawyer. I don't know why but I liked the class a lot. I just looked up their pay and the average pay is about double what a prosecutor makes. The trust and estate lawyer makes close to 100,000 a year!! I thought with 100,000 a year that I could easily sponsor 30 kids!! That would be about 14,000 a year in sponsorship but with 100,000 a year that would be do able. 

My boyfriend wants me to become a trust and estate lawyer because of the money. If it was up to him I'd make loads of money and would give little if any to charity. It's not that he has a bad heart but he believes as long as we have debt that means we don't have enough to give away. I of course, don't agree. If I made 100,000 a year and he continued to make his income there is no way he could tell me no to sponsoring so many kids! The thing is I don't know which option to go. 

Do I speak for victims of crimes who can not speak or have too little of a voice in the justice system (I want to work sensitive crimes) or do I work with those getting their affairs in order but help those silenced by poverty. Both would make me happy and both would be honorable but how do you choose which battle you should fight in? How do you choose which charity or group to help when you know you can't help them all? 

I thought I knew what I wanted and now I'm conflicted because both battles need people to fight for them. I know no one can tell me what the right option is but this whole thought process just made me start thinking how does everyone choose which charity to give to when they know they can't give to all of them.