Right now, the system sounds awesome (almost perfect), but I think there can still be improvements with a mains upgrade. I only use a dac and integrated amp and I'm wondering if I should get 2 high quality mains cables or 1 high quality mains feeding in a high quality power distributor. Both upgrade routes cost around the same. I'm looking into getting these mains cables: http://www.ultimatecables.com/zencart/index.php?main_page=product_info&cPath=66_67_68&products_id=186. They are cheap but are made from 50% SOLID silver and 50% SOLID copper, not the cheap silver plated you see everyday. I hear power conditioners compress the soundstage, so direct feed into AC outlet and no conditioning.