The wiring for a patch cable

When I finally get around to deciding on my own personal cabling standard, my guiding principle is going to be that the progression from warmer colors to colder colors will equate to how much grief you'll cause me if you unplug one of my cables.

I'm no expert either but I'm on board with what you've stated in your question. My opinion is that the vendor is giving you a snow job in order to make more money off of the job by selling you CAT6 cable. My recommendation is that unless you plan on moving to 10GbE (CAT6a cable needed) in the near future then stick with CAT5e. GbE (1000BASE-T) will happily run on CAT5e or CAT5 cable.