I think you have to understand the law of diminishing returns. It's very prevelent in audio. Many times you pay a 100% price increase for small differences, maybe a 3-5% sonic improvement. I'm sure this law would encompass Pass electronics just as it does with all other companies. I've just sold my BAT VK-31SE preamp, which in my opinion, offered 95% of the performance of the VK-51SE for 60% of the price. It all boils down to how much you want to pay to squeeze out that last ounce of music.
Back to the source issue, have you ever listened to an Exemplar modded Denon universal player?
Actually, vinyl is my favorite source, but I didn't mention it because it's either something you do or don't do. Not a whole lot of converts. I'd recommend a tube phono stage, if you can swing it. Perhaps an Aesthetix Rhea. There's something magical about tubes and vinyl, IMHO.
Cheers,
John