For this kind of money, which is a lot for cables, you should be able to return them for at least 80% refund.
Nordost may sound thin, Cardas may sound bloated in midrange and upper bass. I like the recommendation of Transparent. But again, I have no idea if it is what you will really like in your system. I think, Transparent sells direct.
My philosophy is to have cables at least one step ahead of active components.
If you decide to take a risk with used cables I would add Audience and probably Wywires Platinum speaker cables. I heard only Platinum interconnect in my system, though, and quite liked it.

