If the software allows for a correction of the absolute temperature, one could also go with the AD590JH. Less accurate absolute value, but in a metal can likely more stable than the SO8 version.
Chances are one could make the layout to allow for both footprints.
I was thinking the SOIC would couple better with a plane but maybe a can, placed through a hole and thermal epoxy-ed to the plane is better anyway
Something like this, the AD590 can go through the PCB and use some thermal paste or epoxy to couple with the ground plane
I love it when I search for something random on google and it points me right back to EEVBlog. Not sure how I missed this. An original card sold on ebay for $450 last month.