Since they both sound better than what you have been using, I would continue to test the Toshiba against the Sony 700. After longer term listening you might actually find you like the Toshiba over the Sony.
I might also suggest you upgrade the stock interconnects between player and amp. Used lower level Audioquest cables in the 'snake' series such as the Sidewinder or Copperhead come up for sale on Ebay. I am thinking you can purchase a significantly better interconnect, over the stock ones that came with your equipment, buying used at $30 to $50. I am away from home right now, will return in a week. PM me, I may be able to put together a package deal for you regarding speaker, IC, and PC cables for cost of shipping.
Not knowing your older MIT speaker cables, not sure if the Canare ones will make the change you are looking for. I do own a pair of Canares, they are great at the price.
Given you have found a player better suited to your tastes, I would upgrade your stock cable collection at less cost than the purchase of the Loki. Then consider it thereafter. Not that I have anything against one, I am just not sure you will need it till other things are sorted out.
Just some of my thoughts.
