PS Audio P300 or Cardas Golden Reference?


Hi,
Currently I'm using REGA Jupiter, KRC, FBP600, and Celestion A3. I'm thinking about upgrading my interconnector between pre and power or PS Audio power generator P300 (or 500) Which upgrade will be noticable or effective for the amount of money? I think both will be around $500. P300 can be benefical for both KRC and Rega. Please direct me. Thanks.
esmdynamics
What about the Cast connections between preamp and amp? I've hear that Nordost now makes a Cast cable that is very good, why not take advantage of potentially better technology if you have the opportunity?
My experience has been that improvements to power delivery are more noticeable than improvements on any other cabling. YMMV though.
It all matters and can frequently create a sonic maelstrom from which one may find it hard to escape. Use the cable companies loaner program or borrow from a dealer for an in home trial for any changes...it's the only wat to be sure!