If you can find a pair of Harmonic Technology Pro9 + used I think you will hear a substantial improvement. I have used the Neotech and Duelund 12AWG which I still own but have set aside because the HT-Pro 9 simply and clearly outperforms them.
I have not heard the Analysis Plus so can't comment there. I replaced the HT cables with some others I had because a redo of the living room rendered the HT cables too short. After about a month I ordered some Duelund cables on the strength of positive reviews and I was very pleasantly surprised at their performance and feel you would be happy with them. They are skinny and smell funny and great value.
After about a year I reinstated the 'too short' HT cables for a sanity check and they are still connected and staying connected. They can be used bi-wired but I prefer them run parallel. Oh, and they are not skinny!
A very strong recommendation.