I think the 1.8kW DMM servos will eat those Clearpath types, to start with the DMM types are powered by 230V
Yes, an AC servo will easily outperform a Clearpath, and they cost about the same.
A lot of people seem to be jumping on the Clearpath bandwagon lately. They are great, if you want a drop in replacement for a stepper motor. But if starting new, AC servos provide far more power.
Be careful with the voltage on the DMM;s, though. I just got one back today from being repaired. It blew as soon as I powered it up, apparently from overvoltage. They claim they should be safe up to about 260V, they tell you not to provide over 240V. I have about 245V here at home. I'm going to get a transformer to lower the voltage down before I fire it back up.