I suspect with the best DAC money can buy and the best amp and speaker system you will hear something better than you do now but for the most part you would be splitting hairs. If your receiver is indeed a recent $1000 class AVR you are likely splitting hairs using the same speaker kit.
Mits WD-92840 92" DLP - Lumagen Radiance XS, Martin Logan Motion 40s, Ascend Sierra 2s
Older 58" Panny Plasma -DVDO DUO, JBL Studio 530
Pioneer AJs, PSB Images, Usher S520, JBL HLS-610, Definitive SM45, MusicHall Marimba