rca plugs - comparisons?

If I was happy with what I had I wouldn't change; if I was buying new I would get the best available. Good companies don't change unless they can make something better but if you already have one of their previous products you already have most of the advantages of the new product. Only a direct comparison in your system would reveal the degree of improvement you would get by upgrading the plugs. As I said I doubt it would be cost effective. Eichman are possibly the best but are significantly more fragile, if you frequently plug and unplug your system the WBTs might be a better choice.

Ever check out Nordost spring loaded RCA's. Definitely my favorite.

i suggest, constructing or having a technician construct two or three pair of inexpensive cables using 3 different pairs of connectors.

a small investment and your ears, will begin to answer the question.

you will , perhaps, want to determine the qualitative and quantitative differnces, if they exist.

MrT,
your idea per se may be sound. We've trodded similar paths around here. Only you forgot to mention that the technician must be a master solderer. If he is not, and there is a difference in soldering from plug to plug, you'll be listening to solder joints and not to what you are thinking you're evaluating. We found that out the hard way.
Also we did not take cheap wire as you suggested, because we found those unsufficiently revealing. We ended up with better XLOs, Nordost and NBS wires and then did hear differences in our panel. We ended up with NeXtGen and- surprisingly- with a cheapo but very well made Chinese copy of the Nakamichi plugs.