I have the 3000 powered by a Hurricane cable. Just tried the PSM156 (with its own classic power cable). Not a subtle difference, the PSM is WAYYY better. Better image, better soundstage, better bass, better clarity, better life, more musical, 3000 is dull and flat in comparison.
No brainer, get the PSM (not affliated in any way- the PSM is just better - and cheaper)