I thought I'd post what is working for me after about 2.5 years of treatment since my symptoms are recently pretty much in remission. When I got my dx I wasn't able to walk more than a block at a time. Now I can walk about 5mi/day (I was an ultra-marathon runner pre-MG):

Prednisone 20mg/day (down from 60mg)
CellCept 1000mg morning 1000g evening
Mestinon 60mg in the morning (I've stopped using the rest of the day since the symptoms are gone but it very helpful before)
IVIG 1/week

The IVIG is hideously expensive, but it's worked!