I have both a mac (panther) and a pc with windows xp.

I am a singer-songwriter-producer who's always used engineers.
Now i find myself traveling and want to create songs on either a mac or a pc.

I have the garageband installed on the mac and it sounds a bit amateurish.

I want to get digi and learn how to use it myself but for now the price range is a bit steep.

What kind of affordable software could I get to start making some decent-sounding songs?

Thanks