One under-sung option for SO rep (imho) is that, once you've gotten 200 points on any of the SE sites, you automatically get 100 on the others. I think answering questions on the other sites also teaches you quite a bit about helpful question-asking, and gives you empathy for both sides of the Q&A. Personally, I did this through WebApps and English, I can't remember which was first, but there are a ton of SE sites to choose from.
Just some food for thought 