Can't honestly say I've ever gotten to blinds this high in a single heads up SnG. In fact, I don't often make it to 25-50.
For the record, it was a turbo SnG. I don't know about the non-turbos, but I get to 50/100 and even 75/150 on a regular basis in turbos.
My early range was in between your two ranges. I think it ended up being 88+/AT+. I didn't get an 88, but I did get it in with 99 and AT. The AT might have been a mistake, though. I think a tiny bit tighter would have been better.
I think at 25/50 I'm opening up to 77+/A9+/KQ. I still have 30BB, so I'm not quite ready to play the hands that have a tiny edge at best.
At 50/100 or 15BB, I'm taking almost every edge. I'd go with any ace, any pair, K9+, and QJ.