I had an EX140, which was a dual mono-version of the ST140. When I bought it I'd compared it in the store to the ST and found it to be marginally better. I'm not sure if this is what you were looking for.
Get the ones with the "blue and red printed faceplate"...the rest were so weak that they could not even handle a 4 ohm load (junk)...better power supply always sounds best.
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