Paying for music.....as in money....such a foreign concept.....
I guess the only thing I did to customize mine was change the default music catagories. I thought catagories like 'rock' were a bit general, I broke things down.
You also may want to increase the import quality. Its 128k by default. Bump that up to 224 or 320. That will take up a lot more space, but the music will sound way better, especially if you play it over a quality home system.