I would not worry about it, Belkin is good. Cables and interconnects become more important as the sensitivity of your system gets very high. For the foreseeable future I would concentrate on components. Speaker wire would be the first connection to work on when your speakers are over $1 - 2K. Then once your average component cost is over $1-2K start working on interconnects.
In the beginning component performance is key… as well as system setup, and room acoustics. Then, as the sensitivity of your system increases interconnects start to make a difference, and then power cords.