Charles,
I like the MarkBass setup. Been rolling with that for a couple years now. It replaced a Crown Xs500 / F-1X / SWR cab setup. That setup would have probably been a better fit for this gig, but for most of our gigs, it would be just too damn heavy. I can carry the combo in one hand, the extension cab in the other, my bass on my back. With the other rig, one cab was 85 lbs, the rack with preamp, power amp, tuner, and DS-5R weighed about 70 lbs.
The MarkBass setup has plenty of power and a couple tone filters that help you dial in the right amount of highs / lows for small to mid sized venues. Can you get better tone with other rigs? Yes. But for the tone / weight / price balance that I was looking for, this us it.