The other bit of information that would be helpful before responding to your question regards your budget for each of the items you propose to buy. For example, the "best" speaker cable may be the Nirvanas, but they are stratospherically expensive. Help us by establishing some cost parameters.
I think the second thing you should seriously consider is ra-arranging your system, so you can use longer interconnects and shorter speaker cables. Interconnects carry a much lower voltage signal than speaker cables, and they also tend to be cheaper than speaker cables.
I think the second thing you should seriously consider is ra-arranging your system, so you can use longer interconnects and shorter speaker cables. Interconnects carry a much lower voltage signal than speaker cables, and they also tend to be cheaper than speaker cables.