Given that this is a new system, for someone possibly not haven owned a quality system prior, I think I would start with budget cables. She could then develop an ear for her system while it is breaking in and, in the mean time getting accustomed to its sound. Then afterwards any tweeking provided by better cables might be better addressed once she has a better understanding of what improvement she is after.
There are so many budget interconnects available on the used market. I have bought, sold and continue to use Audioquest.
Regarding the speaker cables, 17 is a long run and more difficult to find used. I would consider trying the Canare 4s11. It can be purchased new for ~$1.50/ft online including shipping. Terminate them yourself. They might just prove very adequate, and at a very reasonable cost. If not they could be easily sold.
Given the disparity between cable cost and sonic value for any given system I believe it best to start budget conservative and then upgrade.
There are so many budget interconnects available on the used market. I have bought, sold and continue to use Audioquest.
Regarding the speaker cables, 17 is a long run and more difficult to find used. I would consider trying the Canare 4s11. It can be purchased new for ~$1.50/ft online including shipping. Terminate them yourself. They might just prove very adequate, and at a very reasonable cost. If not they could be easily sold.
Given the disparity between cable cost and sonic value for any given system I believe it best to start budget conservative and then upgrade.