I was looking at this myself when I had a bid in on a Superline. The British websites have a lot on this; probably much more than you will find over here.
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I have a Naim PSU for my CDX2 CDP and a friend of mine has a HiCap DR for his Supernait 2. I can tell both really make a difference.
Don't know about Pardo, but a quite common opinion is: they are different objects, with a different "philisophy". Not better nor worse, just different.
They say Naim PSU will give you more dynamics, control, focus (and that's all true, I can say), while Pardo PSU will give more subtlety and refinement (could not "test" about that).
I guess you won't go wrong with either.
One good thing with Pardo is that his PSU's are so hard to find in the used market (here in Italy, at least) that if you buy one and don't like it, it's usually easy to resell, and fast.