Hi sorry to bring up old thread , but it might be usefull.
I was searching many days and weeks for software free or low cost for my development. What i found is this:
Game Music: Presonus Studio 1 free OR Magix Music Studio Silver free OR Sony Acid Xpress. All of them are free and very good.
For 3D Modeling i found SILO 2.2 is the best choice for modeling assets and the price is $119. For Rigging and animation There are two good choices. Blender free OR Messiah Studio 5. Which is $119.
For Image editing i found Artweaver free because it save TGA files as 24 and 32 bit , Gimp wont give you this option!!! You will have to add alpha channel to your texture to be sure it is 32 bit. And after that u dont even know if it is compressed or not.
So Artweaver and paint net. + MINDTEX for creating normal maps, ambient oclusion maps etc. the price of MindTex is $14.
For pure audio editing i would use Sony Acid Xpress , mentioned above. its free.
For video Editing i would use Magix video edit Silver. Its free promotion.
For uv mapping i dont use silo but i use Roadkill 1.1. its free standalone uv mapper.
hope u found this helpfull.