My current yoga teacher is an Anusara based instructor. He is very light on the drippy woo-woo stuff, thankfully. I like Anusara for its focus on alignment.
I'm down to one 90 minute class per week from two. Two classes per week impinged too much on my strength/metcon work. I do a fair bit of mobility/Feldenkrais work daily, so one long yoga class per week serves me well.
I've been lucky enough to do several seminars with top Iyengar teachers as well. The deep focus on alignment was very interesting and challenging.