Yes I agree with the previous poster I think, from what I've heard, mains cables only come into effect in improving sq in a system if you change a whole load of them, and the system is good enough as well to get any benefits of mains cables.
From what you said about not being sure in your question, I think that's when bias might come in.
I agree the isoteks are good and the Aquarius demo I went to at the Bristol show this year with around £2k Larsen speakers and about 3-4K of exposure amps and a CD player, revealed very good improvements with the aquarius in outright speed of attack of the amps over an IKEA powerbar. But I guess it was a noisy supply with all the demos going on, but people who have used them at home I've spoken to have all said they are good.
With your regenerator I think you've probably tackled electricitity and say you spent equivalent of £300-£400 on power leads, I'd doubt that performance improvements would be huge. I'd rather spend it on other things I think. I might be wrong though.