I am considering a TF420 but a little weary of the 400W power rating. I see they have a 500 watt EU version also that is a possibility. Anyone compare the volume of these amps to an SVT or SVTIII? I usually play through an 8x10 ampeg cab but think I am gonna invest in an el whappo. The SVT is a loud beast, sometimes just to big and loud, where as the SVTIII sounds nice and has plenty of volume for most situations. Is the TF noticably quieter than the SVTIII or should I spend the extra $100 and get the 500 watt version?