Dude, I buy Techflex all the time! Even my home stereo rack the wires are tech-flex'd and heatshrinked to match. Love that stuff. I use a lot of the black with the white tracers too just like you have there.
Those Dynaudio drivers are sick too.
I have a pretty nice system in my truck, but kinda getting out-dated with all these new super-efficient amps and cool stuff out now. I'm thinking of building a really nice, super-efficient (for battery/weight sake), system for my little speed boat. Horn loaded speakers and subwoofers with little digi-amps like those new alpine marine ones.
As far as a car audio forum, I say go for it.