I don't like how the trophy system works (I'm allowed to not like it). I think there should be trophies, but not trophy points. This is misleading and will require all admins to explain how the system works over and over to the users.
Instead, you should get 1 trophy for doing X, instead of N trophy points. Complicated math just complicates the running of the forums.
Dream - why not just give 1 point for each trophy? The user still can see which trophies they've received. I like the idea of different trophies being harder to aim for and get, but can also see why it would be complicated to explain over and over. My guys still panic whenever they see a warn meter showing zero.
Maximillian ... there already is a karma/reputation system though isn't there - the number of Likes someone has received? Or have I misinterpreted what that's for?
Trophies are more like achievements, while likes are to show if someone posts good / funny / interesting / useful stuff. No need for a dislike button either, this way it's all positive. And you can figure out for yourself that if someone has 10.000 posts and 1 like and someone else has 399 posts and 400 likes, which one is likely the better one.