Power cable question.

I am going to upgrade the power cable on my Jolida 502A amp and am not sure the way to go. The PS audio Lab II cable gets lots of positive press but the price tag is stunning. I have also read about the Asylum Power Cable and really like the price. The question is this: Is there $400 dollars discernable difference between the two cables? Which would you choose or do you have a better suggestion?
Thanks in advance
PS: I am thinking about an Ultimate Outlet also, are these worth the money?