You are spot on in your speaker recomendations. I've thrown out my subwoofer & have a new one on order, it's a bit big - 6 1/2 inch paper cone, rather than the 6 inch you recommend; but it is nice & light. Next up will be new center & mains, as I'm sure that the extra conductivity of silver colored speakers will be great.
While clean power is important, you are incorrect in thinking that it is the primary means of getting that truly linear, warm, chocolaty sound. If you were a real audiophile, you'd know that the most important thing is to invest in high end custom power cords for all your equipment.