I think that all of the equipment you listed is an excellent starting point. Before replacing any of it I would heed Lak's recommendations. Every piece of the audio chain is important, and until you have experience with those "fancy accessories" as you call them, you won't know their true value.
In my experience I would leave room acoustics until last, and go for cables, power conditioners and dedicated power lines, probably in that order.
As far as recommendations are concerned, I have different equipment so I am not sure how my choices will work for you. However, if it helps, I use Tara Labs Air series interconnects and Richard Gray power conditioning and am thrilled with the results.
Just my opinion. :o)