RE: Auto tune for Sonar
I'll second that. Pitch correction done as a non-realtime process will always sound much more natural. Often, part of what makes vocal tracks great are their slight nuances and imperfections. Realtime autotuning does not have the benefit of analyzing content in context.
Two thumbs up for Melodyne. I don't use it to make vocal tracks sound "perfect". I use it to make them sound "right".