I know a lot of DJ software have CPU utilization meters because it's important to them. Low-end DJ software isn't well-optimized for parallelism and hyperthreading.
That said, I have a 5-year old i7 laptop and it still kicks ass in music editing while my friend's brand new i3 laptop simply whimpers and dies because he didn't know how to shop.
I work in enterprise now so I'm out of the commercial game and don't follow tech trends anymore. You might want to check out
http://www.notebookreview.com/ and
http://www.notebookcheck.net. Their forums were/are the best resource regarding notebooks.
Intel just came out with their next gen Skylake family. I would get a high clock-speed i5 in this family. Don't take my word for it though.
https://en.wikipedia.org/wiki/Skylak...ile_processors