Id invest this way
buy DBP from RGT with the CFX bundle
save the rest for milkshape which is around $20.
I heard it was on a uk mag so that might be even cheaper to provide as a solution.
MS and CFX go hand in hand with the compatability and tranfer of model data between the two programs.
to save money for the 2d image editing u can use these freeware programs
canvas 6 not 3d canvas
zonerdraw 3
photoplus 5
paint shop pro (latter versions are free v4)
as for audio applications thers a few freeware programs that allow editing of the sound byte and one great one but only runs on faster machines is protools.
its more geared towards composition so u may have to tie it in with say soundforge or cakewalk etc...