Although I have to say that I am not overly impressed with how the new PocketGear has dumped all the freeware off the site, here are a few things you might want to use you 20% discount on:
Wave Edit Pro is worth a look, and comes in a number of different versions.
miniMusic NotePad which is excellent for notation and includes a MIDI export.
So, there are a couple for starters. The offer is open until the 19th of December.