What, if any, component to upgrade? Advice?

So, in a qualifying question for the First World problem department, here's my current system:

1. Triangle Titus 202 monitors
2. Rotel 1072 cd player
3. Sophia Electric Baby Amp (upgraded caps, etc; new tubes 10w/ch)
4. Mapleshade speaker cables
5. Nordost IC's

Which component to upgrade? Or should I be happy with the sweet little system I have and deny the audio bug any further entrance? I like my sound, but it's still a bit too little of a presence than I'm looking for.

Any advice? Budget is under $1000

Thank you in advance.