Seems to me that Audiobahn is more interested in mass production and sales than product quality. Back when I was getting started in car audio, I had a set of Audiobahn components in the front of my car... the tweeters lasted less than a month. A friend of mine bought a pair of Audiobahn tweeters... for him, they didn't even last 2 weeks. I've stayed away from Audiobahn since then. I've heard great things about their subs, but that's pretty much it.
i'd stick with the better known brands as far as amps are concerned. the jbl amps can be had for cheap at an online dealer. that goes for just about any amp manufacturer. when i get my stereo finally going. i'm going with a dei amp or a jbl.