Does anyone here use the looping capabilities of Sonar (or "take" feature of Cubase)? You can sing a single line over and over until it's perfect.
Since it's the same line repeated, you can micro-tailor your diction and pitch, without dealing with the nervousness or tension that occurs when you start a new take from scratch! And if you are monitoring yourself, you can gradually eliminate pops and sibilance with your technique. Hope that makes sense.