Yes.... I think the McIntosh would get old very fast! I think I was still in actual dreamland when I was considering carrying one of those things around. I have a red knob F2B on the way and got caught up in the fantasy of having the Alembic/Guild bass playing through the F2B, powered by the McIntosh..... The blue VU's were hypnotizing me!
So, the Peavey gives you punchy tone and strong, satisfying low end?
The Peavey sounds great. Bridged, I don't hear any difference in punch and low end from my monster QSC into a single cabinet. Stereo into two cabinets, it works quite well, also. If you go over to TalkBass, you'll find some reggae players using it and they are definitely into low end.
The only thing about bridging it is that you have to build a special speaker cable and jumper the inputs. The DSP models and the Crest versions have much easier ways to do it (push a button!).
The smaller mac amps, even the 2105, which was my bass amp in high school, definitely don't have enough headroom for bass, unless you play particularly quietly.