IPC Media would be the best publisher for the author's new magazine because:
1) IPC publishes magazines monthly like the author's proposed magazine, while Bauer already publishes similar established rap/hip hop magazines.
2) IPC's only similar magazine, NME, has a different focus than the author's proposed magazine, allowing it to fill a unique niche.
3) Publishing with IPC would introduce more competition to IPC and Bauer, increasing IPC's market share and profits through a broader audience reach.