Make sure you buy something with a UL rating.
One "high-end" manufacturer, apparently, has a difficult time determining the difference between hot and neutral with power cords. If those are reversed, then you can bypass the safety fuse and end up with an electrically hot chassis if something goes wrong. That can turn you into the ground connection. Not advisable with high voltage.
So look for a UL rating. If there is no UL rating, ask why. If you don't get a good answer, beware.
Personally, I get UL rated used power cables for $1 each at a local swapmeet. They're fine.
If you're concerned about EFI/RFI, you can get a filter for $3-$5 at places like Digikey and Mouser. If you want to take noise off the line, pick up a $50 isolation transformer. The side benefit to those is that they're proven to work. Not just hype, claims and testimonials.