Ok, I'm in.

I'm also not a big fan of there being a difference between 3rd and 4th place money. Just pay them equally, which for me would be something like this:
16 man
Winner: 8 buyins
Second: 4 buyins
Third/fourth (no bronze match): 2 buyins

32 man
Winner: 16 buyins
Second 8 buyins
Third/fourth (no bronze match): 4 buyins