Hi Neil, I'm pleased to hear that you are still enjoying the 337
Andrew,
My preference is for the TDA1541 based players and the cream of the crop in my opinion are the 337ESD and 555ESD.
I do find the PCM58/338ESD very enjoyable with excellent clarity but for me the TDA1541 has a certain analogue like
je ne c'est quoi that I find more musical and ultimately more pleasing for long-term ownership. There's a reason why the likes of Audial, AMR and Zanden are so obsessed with this DAC.
Don't get me wrong though, the PCM58 is a fine DAC (probably the best 18bit DAC ever) and the 338 is a fine player. I will be keeping my 338 but my 337 and 555ESD remain my favourite of all time and are lifetime 'keepers'.
The build quality of the 337ESD and 555ESD really is quite awesome (especially the 555ESD) and my modded 337ESD is still the finest music player I've ever heard!
The 227ESD is also nice, it has a cheaper build (plastic chassis etc) and the second tier KSS-151A laser rather than the mighty BU-1/KSS-190A but the PCB layout is excellent.
With regards to the PCM58 the X7ESD would have to be king (staggering build quality) and I'd love to add one to my collection some day!
If you find yourself in the Sheffield are you'd be welcome to pop by for a listen to my 337's and 555ESD.