10 is a typical value for me, you should use the bare minimum of noise reduction. There should still be a hint of hiss-noise between words rather than total silence, as the onset of speech after total silence is jarring, (see comfort noise).
You could put the mic in a box lined with acoustic foam, ( a mini DIY vocal-booth ) …
http://www.youtube.com/watch?v=UTeUeRxAS7M [ home made ]
http://harlanhogan.com/images/portaboothFullFront.jpg [store bought ]
I’m new to Paul-L’s de-clicker plugin, so I’m still experimenting to find optimum settings , but it definitely works, see attached wav …