Thank you all for your responses so far.  I probably should edit my 
original question, though. What I am looking for is the 3 cryostat 
models that are most commonly used/found in histology labs today.  I'm 
not looking for the "best" models, but the ones you would find the most 
of out there in the U.S. .  This would also include models that are not 
made or sold anymore.  

Thanks again,

Don Sk