I was just wondering if there is any tonal difference between the new svt's and the previous model. I might have a deal to get one of the older ones. Are they just as good? Another thing that's holding me back is the claims about exagerated power claims. I'm selling my GK 400rbIV because it just doesn't have the headroom that I need. Does anyone know if the svt 3-pro (older or newer) has more headroom than the GK? Thanks for any help.