The best videos I've seen for "techno" are put out by the demo scene. It's a true marriage of technology to make something beutifiul in that everything is programmed, including the visuals (numbers, not fancy pre-made computer filters). One of my personal favs:

http://acidgrave.gabber.org/flash/kewlers-we_cell.swf

It has a good track score and some awesome visuals. I recomend downloading the program so you can run it full screen. The above link is just a streaming video that is actually a larger download than the program itself. (18 megs vs. about 2 megs if I recall correctly).

BTW, the demo is called "We Cell" and can be snagged from here:
http://kewlers.scene.org/prods.html

I recomend pretty much everything these guys have done as it's all both aurally and visually pleasing. It's a shame the group split.