Glad that helped Matt. That less than 1 db spec on the RIAA curve is pretty much the main thing, other than the impedance matching between the cartridge and line level input of whatever preamp stage you are using. Balanced inputs are seldom found on home audio, they are mainly reserved for pro stuff.
As far as the quality of the caps, the good stuff is so cheap compared to how less cheap the Chinese stuff is, it's hard to imagine anyone using something that costs a penny or two less when they're manufacturing something for audiophiles.
That said, I have replaced all the electrolytic caps in the crossovers in my mains with Japanese manufactured polypropylene. They're kinda big and expensive, but the main difference in sound is at each end: The microphone (or in this case the stylus) and the speaker. Generally speaking, the amplifying (and equalizing) electronics in between is an order or more of magnitude down there in their effect on coloration as long as the gain structure is respected. The latter is least respected in pro audio - there are bunch of sound men out there who have no clue on gain structure. But that's kinda off this topic.
Really, when it comes to pushing audio signals around, impedance is a big deal. In general, you want the lowest impedance paths for your longest paths.