If you’re using it strictly for voice, then you should check out Voxformer
http://www.voxengo.com/product/voxformer/
It’ll very cheaply give you the "voice of god" on the air too, hehe. But yeah, the 4 band spectral gate in it would do a decent job on playback too, and it can be used by itself. Good double purpose.
It’s not free though. I don’t remember seeing one that’s free and multiband (or good). It’s only $70 right now, which is an extremely good deal considering a hardware analog processor with even half of the capabilities are $300+ and a comparable digital unit doesn’t even exist yet at any price (and there are several multi-thousand $ units out there)
Try the demo. 🙂
As for reverbs on Windows, this one is KILLER at any price, it’s a true algorithmic reverb, and it happens to be free. 🙂
http://dl.dropbox.com/u/4063301/epicVerb_1.5.rar
I recommend checking out everything he’s done, it’s all stellar. 🙂
http://varietyofsound.wordpress.com/