IMO, most denoising programs would turn that into a sick-making gurgly mess. I get much better results simply using eq. Try a steep lowpass above 2K and a steep highpass above 1K. (Basically the telephone vocal trick).
I find the residual background hiss would be less obtrusive than a fiercely gated noise floor jerking in and out. But maybe that's just me.
There are some extremely expensive noise reduction software that might do an excellent job, and it's way out of my price range so I haven't investigated. I think it's called CEDAR from memory ...
Back again ...
http://www.cedar-audio.com/products/...ge/camnr4.html a good read anyway.
I've had a little success with the Voxengo plugin - but I was mainly looking at music applications, and decided to run with normal gating and eq options.