For a great article on doing noise reduction yourself, check out this link to DV magazine:
You may need to register (for free) to view it, but it's definitely info that's worth your time.
The article is really aimed for video post and is a little out of date - but it's still a useful reference. As you can see Cedar - which is used a lot in audio archiving - starts at over $ 5000.
OK, it looks like a good time to time to start a survey / mini-review ...
Algorithmix (German company) make expensive hi-end products but they also have Sound Laundry:http://www.algorithm...e/index_products.htm
Sound Laundry has been around for a few years and I don't think it's been updated recently. It works as a stand alone modular system.
You can read about their flagship products here: [ dongle & lots of Euros required ]http://www.algorithmix.com/
While we are on the proverbial autobahn, Magix offer the MAGIX Audio Cleaning Lab 11:http://site.magix.ne...dio-cleaning-lab-11/
From my own audio snob POV, it's basically is consumer 'toy" version of the some of the in-built NR and FX features found in their DAWs - Samplitude and Sequoia.
This is quite similar to the NR plugin in Sony's Sound Forge. It samples the audio and makes a "noise print" which is used as the basis for cleaning the audio.
Virtos is having a 50 % off sale:http://www.virtos-audio.com/
I think Virtos is pretty effective in comparison to Sound Forge, Sound Soap, Voxengo etc. and is certainly great value for what you get, esp. if you went with the Noise Wizard bundle.
In NR there is something to remember. The more you remove the more you'll find. You have to know when to stop. The less the better.