I also recommend getting some on trial. Power cords are often component dependent, so mix and match works out best after auditioning.
In your price range, I'd recommend Wireworld Electra (very neutral and refined) and VH Audio Flavor 4 (muscular sounding, but very stiff physically). With the VH, you can also choose different plugs to tune the final sound (copper and gold for a denser, earthy presentation, rhodium for more detailed, analytical sound). Or combine different metals at each end - the permutations become frustrating, really!