Seems like the thread fizzled out. Here it goes again ... "Best RCA cables for the money" = make your own silver wire interconnects and speaker cables ... laventure (http://www.laventure.net/tourist/cables.htm) You don't have to make them from silver though. You can get 1.2 mm diameter copper by stripping down heavy house wiring (25amp) from hardware store. You'll get quite a few solid Cu wires from every metre of it. Silver does have a slightly lower resistance per metre than copper ... but (oh no, here's the arguments coming up again) I wonder if you can hear it.
If not into DIY, then one of the earliest posts in this thread ... DNM solid core cable. Been around for ages. The designer is hifi designer of note. Been positively reviewed for ages too. Like all cables it has some reviewers saying there are flaws in highs/soundstage reduction. But as a plunge/experiment for someone wanting to go from standard cable, they are an excellent and reasonable start.
Re the overall argument about hearing differences in cables ... the best rationale behind this is to consider a simple speaker cross over. If this has been mentioned already in this thread, apologies. But I like the analogy. A speaker cross over is a combination of resistor, capacitor and inductor of different values which alter the signal to allow the bass cone to filter off at its higher frequencies, and the mid/high driver to filter off its low frequencies. Every design of cable has a different resistance, capacitance and inductance. And of course the length multiplies this resistance, capacitance and inductance. So electronically speaking, every cable is adding in a resistor, capacitor and inductor into the stereo equipment chain. IE a cross over which has the potential of altering the highs or lows, or tone in general much like a speaker cross-over. But we are talking about small amounts/effect compared to a cross over. But some people have better hearing than others. And some people just like bragging about their cables. If you are happy and enjoy listening to your system without trying different cables ... go for it. If you enjoy DIY'ing cables or even buying them on eBay/brand new and seeing if it hightens your enjoyment of the music and/or the hobby ... go nuts!