Thanks, Scott and Bob! Good information.
I'm settling on overnight camp at Iceberg Lake. If I can obtain a permit for a 2nd night out I'm considering Mt Russell as well, as long as conditions look good. I have an overnight permit for Fri/Sat Memorial Day weekend, but could climb on Thurs if I can get a permit, as my business in SF ends on Tuesday evening. Doing a Whitney/Muir/Russell 3-fer would make for a memorable trip!