I have now completed c25k and started B210K,
I was a little lost after C25k and tried lots of apps and I have now started B210K and completed my first run on Saturday.
I have found an app that I love and run it at the background of B210K its called Tempo Magic Pro.
The app lets you use your own playlist and adjust the tempo to your running pace, you can lock the bpm so it plays the same bpm for all your songs. It is amazing. From my first use of it I have run faster without noticing, sounds silly I know but it really works.