Mveloo,
Very nice set-up! Modding the CD/DVD player with some better caps, diodes, chasis dampening, and other tweaks will yield some very nice sonic results. I just finished modding my EAD CD-1000 with Rubycon caps, Fairchild "stealth" soft recovery diodes, silver wiring, chasis dampening, and power supply tweak. Also, speaker crossover upgrades will take your speakers to the next level.
Mike