Shunyata X series power cords

I'm not sure which is the most VFM cable in the Shunyata range ie. the best bang for the buck, the Theta, Alpha-X or Sigma X? My comfortable budget is at the Theta's level but I could stretch to the Alpha-X if required. Sigma-X is a bit too much for me though but I might consider it it's a significant night and day improvement from the Alpha-X. 

I wish it would be either Theta XC or Alpha-X XC though. 

Yeah I haven't heard the range above the Theta so with that comparison I can't help. I heard the Sigma range is quite a bit less relentless and a bit more relaxed than the Theta so maybe the Alpha is similar. Trying it is the only way to know :-)

@Ryder  I stand by my comments from last June about the Alpha-X and Theta power cables. I don't have any experience with the Furutech cables you mentioned so I can't comment on those. I also have never listened to the Sigma-X NR cables, although I would assume that they would be at least slightly better than the Alpha-X in some ways. Regardless, the Alpha-X is a wonderful power cable!

I'm still using a pair of Theta NR for my Atma-Sphere Class D monoblocks, while using Alpha-X in my preamp (PS Audio PMG Pre), DAC (PS Audio DS Mk2), and streamer (Innuos Pulsar). The Theta cables on the amps sound clear and transparent, and they bring an outstanding 3-D soundstage, with a natural layering of instruments and voices. They are very engaging, lively, and fast-sounding. However, the Thetas can be too energetic in a bright system or with the wrong components. In my system, they provided a lively energy to my amps but too much energy to my streamer, DAC, and preamp. Fortunately, the Alpha-X cables are exceedingly capable and well-balanced, and they feed my digital gear with ease. The Alpha-X produces a "big" sound that is natural, musical, sweet, smooth, and easy to listen to. The Theta is a good cable in the right system, but the Alpha-X is significantly better. 

With regard to the issue of either NR or XC versions of the Alpha and Theta power cables, Shunyata recommends using the NR versions for both amps and sources. They recommend using the XC cables only to connect wall outlets to Shunyata power distributors that already include noise reduction tech inside.

Hope these comments are helpful.

Thanks @sdl4 very useful. I"m now looking at the Alpha-X NR.  I asked the dealer the same question and he told me the NR sounds better than XC.  I don't use any Shunyata power conditioners so it makes sense to go with the NR power cables. 

@ryder I have several Furutech DPS with FI-50 NCF rhodium connectors, a couple of Shunyata Alpha NRv2, one Delta NRv2 and thanks in part to the good advice received from @sdl4 above, one Alpha-X NR version.  I believe the Delta may share some of the higher energy/brighter/fatiguing qualities referred to above in relation to Theta.  I do not experience the same with either the Alpha NR v2 or Alpha-X.  The Alpha-X is indeed an outstanding cable in my experience, and a clear step up from the Alpha NRv2 in terms of black background, music sounding more natural and feeling closer to a live sound.  I experience DPS as silky smooth, with great timbres, textures and good bass etc as described above.  I am using Shunyata on my source gear and DPS downstream of that.  Both have a very open sound which I think makes them complement nicely in this respect at least. I haven't noticed any obvious incompatibilities from running both brands like I have with another brand tried in combination with DPS.   I have read varying reports about whether the Alpha X-NR or XC version would be best between the wall and my Gigawatt power conditioner.  On the one hand, the Gigawatt is a power conditioner and the XC versions are commonly used on conditioners, but on the other hand, my Gigawatt does not have the Shunyata version of noise reduction technology already built in, so perhaps it might be suited.   So I tried placing the Alpha-X NR from wall to power conditioner and that is where it remains.  Works very nicely.  I would definitely recommend going for the Alpha-X over Theta.  I doubt you will regret it!