A few thoughts. If the system sounds good enough now, there is no need to change anything, certainly not untill the question of adding preamp or upgrading speakers is answered. At this level I would not mix brands of interconnects and speaker cables unless I wanted to experiment with hundreds of brands. The fact that Rowland is wired with Cardas and Wilson with Transparent means exactly nothing from audiophile perspective. This is a digital source transistor based system, I would think that it needed some 'tubes' in the chain, that's neutral enough but full bodied cables that would bring out colour and texture, as opposed to coloration and additional digital artifacts.
Are we talking about XLR balanced or RCA cables, by the way? If balanced, it's easier and less expensive.
Are we talking about XLR balanced or RCA cables, by the way? If balanced, it's easier and less expensive.