Great seating/standing advice PeggyR.
For almost my 35+ years of attending the ballet at the SF Opera house I have stood. You can't beat the price. I was crushed when the Dress Circle standing room was elminated in the renovation.
I'm not a fan of Dress Circle. That slant upwards bugs me. So occassionally I sit in Balcony Circle, towards the front if I can. Yes, it's high, but I like it due to no over hang and with opera glasses to enhance the experience.