The PS Audio Lab cable is well worth the price IMHO, based on what it did both for my system and my friend's.
He has a Cary V12 and it just made an incredbile improvement. I have a PS Audio HCA-2 amp which draws very little juice, so I bought the Mini-Lab cable thinking that would be the ultimate upgrade. I was wrong. When I borrowed my friend's Lab Cable, it was a big improvement for my amp too. So now I'm a believer.
I should mention that he and I tried some of the cheaper "value" cables and homemade cables (by stores) and none of them measured up to the PS Audio products. Some were very truly awful. It may be tough to pay that much for a (Lab) cable, but it will deliver goods.