Blighty, the Markertek is built with Canare star-quad cable and Canare connectors; while they're not among the most expensive, they're not cheap-looking. Maybe you were looking at the truly cheapo NecTec cable on their site. The Markertek in a stereo-mini-to-mini configuration is probably a best buy for a quality cable, and I'd be surprised if a pair of the RCA-terminated cables sound much different than what cajunchrist and I listened to and liked (they probably sound better). Trying a pair of them would not set you back too much; pick your lengths and colors, and give them a try. If you go beyond your list, and don't want to break the bank yet, consider Straightwire Chorus.
Any of those on your list, with the possible exception of the cheap AR, are shielded against EMI and RFI better than what you have now, and I bet you will notice a drop in the noise floor. You might think that's a drop in highs and a loss of "air," but what it means is less hash and grundge passed along.
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