wow, flashback,
that was my first mini cable ever.
I dont know much about tecnec,
Id recommend the Neutrik 1/4" connector and switchcraft female 1/4" TRS
that one you linked looks kind of cheap, cheap generic connectors are the last thing you want.
Neutriks and Switchcrafts are the ONLY connectors I will use, just because they are industry standard in the music biz, and I have had nothing but good experience with them.
The boots I use are adhesive lined, using a hair dryer IIRC. The pic you linked used some wierd cat cable I picked up at frys and sounded horrible.
Starquad is a nice cable to start with, but IMO the quality of the conductors and insulation are rather poor in comparison to other stuff I have worked with, sonically its pretty good but too inflexible for my tastes. Should be fine for headphone extension, but depending on the length of the mini, you might find yourself fighting with it.