404 and Dunamis are dead on! Go ahead and take the MP3 route. However, I'm not a fan of Serato or Final Scratch. Only Ableton for me!
well right now, I have no choice. Final Scratch eats lot less cpu than Ableton. I got that new mixer, fixed the minor problems with my harddrive and when I open Ableton, load some music and then start midi, cpu goes down the drain. Ive done it before with just that X-Session and my laptop but now its majorly slow, and yes, Ive done just everything for performance on a laptop.