Photos of the insides would be great. I think Dave did a teardown on one of them. Might have been the xantrex / sorensen power supply though. Are they all the same company these days or are they separate?
I looked at getting one of their 50v 20a 1kw rack mount units for the workshop but was put off by the fact it couldn't put out more than 20a which would make it a 400w power supply most of the time in my application (Around the 20v range), I already have a 0-30v 0-20a power supply that does that job nicely. I saw a AIM-TTi unit that can do 1200w upto 60v / 50a and it changes its maximum output current depending on the output voltage so you had the full use of the 1200w provided you didn't go over 60v or 50a (20v 50a 1000w would be the max, 30v 40a 1200w, 60v 20a 1200w would work etc...)
I found a HP6012A power supply that is auto ranging so it acts in a similar way to the AIM-TTi unit (Upto 1000w, Still 60v or 50a max). It is quite big compared to the TDK / Lambda power supplies (They are 1RU from memory whereas this is 3RU) but I am really happy with it. They make a 6012B which has digital meters, then the 6032 which has GPIB. There are a few other voltage / current ranges available too (6011, 6013)