Long Exposure noise reduction

I'm planning on shooting some wide angle long exposure (30s) time lapse sky images on my Nikon D7000 and was wondering if you would recommend using or not using "high ISO noise reduction" and/or "Long exposure noise reduction".  I'm not sure what ISO I'll be using yet, but from some sample I've see it could be around 3200.  I want clean exposures, but don't want to loose faint stars either.  Looking for a happy balance.