IMHO, sticking with one brand has the advantage of providing a base line. After that, you will have a clearer understanding of what cables (quite possibly different) work best between different components. Though it can be challenging to actually extract opinions from often times diplomatic and/or dealer sympathetic manufacturers, finding a consensus from amongst the different maunfacturers of your system can provide a very helpfull start. Bear in mind that some components, like some gear from Naim, Spectral, etc., for example, may have unique requirements that limit choices.
Sticking with one brand
I am going to buy some Kimber speaker cable and was wondering if you should stick with the same brand in your entire system?