I had a Taipan Alpha version sometime ago and while its a good powercord, the Helix is miles ahead of it. The older model Taipans have too much glare or upper mid energy for my taste. I also had a DCCA Extreme Ref and it was a decent powercord, there was something about it that made me want to sell it. Don's newer cords are better I am sure but you might want to consider stepping up the line on both of those cords you have.
DCCA or Shunyata help?
I've realized quite a nice increase in detail after installing some NOS tubes in my 300b integrated amp. Now, I've kind of got it in my head that this improvement has revealed a need to upgrade power cords. I'm currently using an older Shunyata Taipan and am looking hard at a DCCA Eminence PC. Any shared experiences and thoughts on these products will be appreciated. Also, I'm more than willing to hear that I should stay put.