I've got a '97 sport and weigh it as follows:
400lbs lead under back seat in 20lb bags.
300lb side sac either side of the engine as far back as possible.
300-400lb locker sac in ski locker
I've found there is absolutely no need for any weight in the bow, but depending on the shape of wake you are after, you can add a little, but bear in mind the ending is in the middle (obvious statement) so it really doesnt need much up forward.
I've bought a few new sacs and will experiment with laying one directly in front of the back seat and do away with the side sacs, this will mean a little less weight overall but give the feel of more space.