There's bass on that track?
Haha!
I used to use 2 SVT's full stacks, that is, 16 10's to keep up with my guitar player and drummer. Then I got a GK 2001RB and a Mesa 8x10 and problem solved. I liked the bellow and warmth of the SVT, but there are plenty of lows and low mids with the Mesa, and all the mids and highs you could want as well. And after using the Mesa, I think you might find the Ampeg pretty dark, and maybe a little harder to make your tone distinctive.
There was an adjustment period; I had to rethink EQing mids quite a bit, but it's more than worth it. I think I got better at hearing and dialing in mids as a result. I think you'll find you don't have to beat the **** out of the string 100% of the time to get some clang and bang, which is what I felt I was doing with the SVT. The horn doesn't turn all the way down, which would be nice, but it's OK. I play with a pick and plenty of distortion, by the way. I have the Mesa 4x12 also, which is definitely cool, a little broader tone-wise, probably better for more classic rock type tones, but if I had to do it over again, I would get another 8x10. Anybody want to buy a 4x12?
Also, if you play a fair amount of shows, all the other build features, like the burly inset handles, rails, and bottom handles are pretty useful. The wheels aren't fantastic, though. Good luck!