Hmm...what kind of namahousou do you prefer? Some of them just talk and talk (especially when drunk orz) while some play/sing songs while others do random things :3. Most of the time I try entering everyone's lives and just join comms of those I found interesting. Anyway, here are some I listen to:
- OwataP because he talks fast and is funny and has a cute BGM XD.
- Yukkedoluce because he draws while broadcasting or sings.
- LeleleP - because he plays the keyboard a lot :3
- wowaka - because he plays the guitar and sings during broadcast

I strongly suggest you listen to P's that you like, since it makes it easier to warm up to them :)