I'm not hugely knowledgeable about classical music (beyond Music 101), but my wife and I have been listening to a bit while she's pregnant in order to get the "Mozart Effect" on our son. Just my observation from our limited classical collection, but the recordings with smaller ensembles seem to sound better than full orchestras. Knowing that you like techno stuff, you might appreciate some of Bach's harpsichord concertos for multiple harpsichords.