I was going to do the vocal booth thingie, but between the ventilation, lighting, monitor, etc, and cutting the physical size of my small studio, I decided to just cut my noise sources instead.
I put the computer in the next room and that made a huge difference in background noise. It's actually kind of weird working at the monitor when you can't hear the computer running. When vocals are being done, all power amps, synths, everything but the bare minimum gets shut down.
For the type of music that I do, which is mostly progressive rock, this method works very good. And I can still breathe!!!
Poly