Hi Kzhtoo,
I would not recommend mixing other cables with Nordost. I have tried without success mixing in other brands such as Cardas, Crystal and Ecosse.
In the finish I arrived at one simple conclusion. Cables add another variable to the system. Multiple brand cables = multiple variables. In HiFi it makes life more controllable when variables are reduced. Nordost has a 'house sound' that is surprisingly consistent across the portfolio. This is extremely helpful in not only reducing variables and attached risk to these - but in also creating a loom synergy which in certain instances seems to sum to greater than the parts. YMMV.