$500 to spend on my '97 Tige 2000slm comp.

I am fairly new to wakeboarding but i have a good grip of the basics and need to improve my boat to match my ability.
as of now i have nothing so i was thinking of either a extended pylon or Monkey bars (trying to find used). then blowing the rest on fat sacs. am i missing anything that might be far more important? should i save alittle more and get nicer things? please give me your input.
the bow is closed so i could put some stuff in there. also considering 2 250 lb lead under the rear seats because its pretty cramped as is.