High priced power cords and power conditioners????

I am looking to upgrade to the higher priced power AC cords from JPS Digital, JPS Power and Audience. Should I get a power conditioner like the Audio Magic Stealth or Shunyata Hydra first before auditioning the higher priced cords like the Elrods, etc., or get the cords first.

For those of you who have tried the different power conditioners, which ones do you recommend and what cords do you recommend with your units?

Thanks