I see you have both a CD and DVD. How about a nice DAC for 2 channel music? To give you more cash for the DAC, you could also sell the CD player and just use the DVD player as a transport, although that Sony CD player does make a good transport. I agree that buying more music (and DVDs) is always a good use of cash as well.
Pick up a Blue Circle BC86 Noisehound ($110) and plug it into an open outlet on the monster, or into the extra wall socket. That should take care of the power conditioning. Two BC86 are even better.