A "sensible" priced power cable is the one supplied in the box with your Krell, the same cable they do their R&D with.
I know there's many who swear by super-dooper PC's (and who's opinion I respect), but I just can't imagine how a higher grade PC than your household wiring can make any difference. IMHO, the old adage "a chain is only as strong as it's weakest link" applies to your power supply; unless you run a dedicated line back to your fuse-box, then there's little point in using anything more than a well-made standard quality power cord.
I know there's many who swear by super-dooper PC's (and who's opinion I respect), but I just can't imagine how a higher grade PC than your household wiring can make any difference. IMHO, the old adage "a chain is only as strong as it's weakest link" applies to your power supply; unless you run a dedicated line back to your fuse-box, then there's little point in using anything more than a well-made standard quality power cord.