connection of the better sounding IC ,please

Hi, I am in the process for amps upgrade- going from a SS Integrated to a separate Tube Preamp and FetValve Amp. I have been using the TruthLink IC.(by harmonic tech) and quite pleased with it. If I would get a pair of less expensive (sonically not as good as TruthLink ); I wonder which direction should I connect the IC ?- should the better sounding IC. be connected from the source to Preamp ? or from Preamp to Amp ?
Your opinion and suggestions is highly appreciated and thanks in advance
Simon