Texhnolyze is my least favorite ABe show, mostly because the plot flounders so much. ABe wasn't involved in the writing like he was with Haibane Renmei, just the concept art; and it was godly.
It has its charms though. Make sure you watch the hilarious outtakes.
BGC and Lain are my favorites in the genre.
(Original BGC, not 2040. Blech.)