AC Power cable for ARC Ref 5 se.

If you want to try a different power cord I would suggest the Cerious Technologies Matrix Power Cord. I've been impressed with this power cord and I've talked with several audiophiles the report very good results using it on ARC products. There is a trial period (see the website for details) and it could be returned for a refund if you are not happy with it.
Perhaps you could demo a few power cords at the same time that have a return policy, then all you need to be conserded about is the break-in time.

 Power cords known to work well with ARC geare are Sain Line, Shunyata, and Synergestic Research. I have heard good things about Wireworld and Transparent but don't know anyone who uses them. ARC uses Sain Line and Shunyata power cords and cables in their listening rooms. They also use Shunyata VTX internally in thier Reference gear.

 I chose Shunyata Alpha HC for my ARC gear. But that was a few years ago. Sane Line was slightly better but much more expensive. I have had both ARC Litz cable and Synergistic Research in the past.

To @lostbears list I would also add AudioQuest -- my primary ARC dealer (Optimal Enhancement) always gets great results combining ARC amps with the latest AQ cables and I'd imagine the Storm series would be a great match -- I currently use AQ WEL on my Ref 2SE Phono and SR Galileo LE on my Ref 40

lostbears. How is Shunyata Research Python Helix Alpha .. Also would i need a 15 amp PC? 

Also How is  Shunyata Research Python VX  ?