can't believe Lords of Acid haven't been mentioned. They are what I call techno. NO REPETITIVE, BORING BULLSHIT. Their songs hit you with a bang right when they start. the catchiest techno I've heard.

download by Lords of Acid:

Hey Ho (very dark & sinister industrial techno. starts off with the march of warriors, then hits with a very demented loop. awesome.)
Drink My Honey (very industrial and crazy with tons of screeching squeels, rough grinds, & hard beats. has a very nice adrenaline buildup in the middle too.)
Let's Get High (funny kinda song with a drag queen that keeps saying "let's get high, and have fun!!".. very fast & castlevania like.)
Marijuana In Your Brain (slow reggae at times with opera, and really sped up techno mixed in various breaks)