Squeezebox 3 As A Preamp?

I am having the constant upgrade itch, however, I am on a budget and I am sticking with my Squeezebox 3 as a source. My question is, how can I upgrade my Squeezebox 3 sound the cheapest way possible? I have an old NAD 3155 integrated that I am impressed with, but it does not have a remote and it is not quite what I am looking for as far as sound goes. I was thinking about keeping the 3155 and using its strong 55 WPC amplifier section and buying a great, used preamp. I was also thinking about buying a great used amp and using the Squeezebox 3 as the preamp. Keep in mind that I do not want to buy a DAC at this time, that will come next. Power is not important to me, just the most lifelike sound possible with a budget in mind. I cannot have too much power, I live in a condo with grouchy neighbors.