Sorry I missed your post Ubergeek. I have looked at hall effect sensors, but they don't provide the accuracy i need (16 bit). I don't think its a very expensive method. Accurate hall effect sensors can be very expensive as all.
Mike, I understand the common mode voltage range of the IA. Also, for some reason, Zetex doesn't state very good accuracy on their datasheets (1-2%)
So you don't see a problem in the way I tied the floating ground in my last schematic?
Thanks,
Omer