My recommendations for Blue Jeans cables was in the context of interconnects between your turn table and pre then fromthe pre to the amp. Depending on how your equipment is laid out, a 1m pair should suffice between boxes. Over the years, my equipment rack has grown and I'm starting to wish I had used 1.5m cables when I rewired my turn table (the cables are hard wired on one end) instead of 1m cables.
If you really want to get into some fun, you can make your own interconnects. A cheap and very nice choice is simply to use a single twisted pair sourced from some Cat5 wire and solder some RCA connectores to the ends. If you want to go more esoteric, have a look for Chris VenHaus's diy silver interconnects. I made a number of these (slightly different from Chris' directions) that turned out very well. Might be more challenging to procure parts right now, though...
The real key, no matter what cables you choose, is to keep low-level audio cables away from AC cables to minimise noise.