Just go ahead and buy the SCT from Eric at Innovative.
The edge only changes the stock computer files and fools it into dumping more fuel into the motor. The SCT writes a completely new file that will tune pretty much every single part of your truck and make them work TOGETHER. You will see improved throttle response, lower egts, and more MPG...I know that I did.
And in the grand scheme of things its only around $400 when you just spent $$$$$ on a turbo.