I can't see much more that I can do given the budget. I'd love to hear your comments/suggestions about this system, after all we're in the same boat in this hobby. Thanks.
The HK CD changer you are using has a digital output. Pick up a used Digital to Analog converter (DAC). That would be the biggest bang for your buck upgrade while waiting for the Sony. There is a Krell/Soundstream DAC-1 that goes for around $125. The original MSB Link DAC goes for about $150.