I need some advice. I am considering making the jump to a bigger amp, and am interested in the "Ampeg sound". I will be playing heavy rock. A 4x10 cab is all I will probably need, so I was considering the BSE410HLF cab. But which Ampeg head would be best with it? Specifically, how big a difference is there between the SVT 3 Pro, SVT 4 Pro, and SVT 5 Pro? Also, has anybody used the overdrive channel of the BSR amp? Could it be used instead of an OD pedal? My main bass is a Fender MIM Jazz. Thanks!