Fellow Chordies.....I ended up getting Song Surgeon after poking around and checking features and what not of several, including the others talked about here.
Seemed to the the best overall, more user-friendly and has the look & feel of Cool Edit and Pro Tools. A biggie for me was being able to downloading directly off YouTube.
I tried out the song surgeon demo and pretty much was sold...the money back guarantee didn't hurt! Doesn't matter what brand you decide on, slow down software is a must-have to improve quickly!
Here's a link to check out SS -- http://songsurgeon.com