I would have to agree that there are to many subgenres to catagorise techno into...... some of these subgenres are even geographical in the country!
We have a number of dj's playing on our system and I would have to say I'd have a lot of trouble trying to identify different styles. I think we are moving towards the european attitude, if it's rocking then I'll enoy it, don't try and pigeon hole it - music is there to make you dance not to give you a puzzle!