Dear D.H: IMHO a Goldmund Reference vs Walker is almost useless comparison because the Walker comes with a dedicated tonearm and almost always the Reference too but a different tonearm, so a comparison is heavy dependent on those tonearms.
IMHO even in either TT and with the same cartridge the performance with two different tonearms means two different performances mainly because the tonearm that because the TT.
You ask for the sound of these top TT's, IMHO if these TT's has a " sound " other than neutrality a Rega can even its quality performance as stand alone units.
Anyway, always is interesting hear opinions on the subject.
Regards and enjoy the music,
Raul.