What is a good program for creating a custom mixtape?

I'm looking for an entry level program to make mixtapes. I want to be able to blend songs together and take small clips of songs. I also want to be able to make it into one continuous track as well as be able to manually make track markings. I have messed around with Djay, and seems cool, but I'm wondering if I have better options. It also has to compatible with OSX. THANKS!