Doug, I have a considerable number of LSK170 that are already grouped by Idss. In general, they fall into the Toshiba "V" grade Idss classification. I'd be more than happy to ship you a bag of them and let you choose whatever pairs you'd like.  
 
Failing that, I have a considerable number of the Toshiba parts (both binned by Idss, and still in original packaging) that I could send as well. 
 
I use a similar topology with my NOS DAC, except using a eight legged devil instead of a transformer  
 
I guess I was referring more to this type of topologies discussed in this thread, but I appreciate the information about DC offset. I wouldn't have though about that  
 
diyAudio Forums - CHOKE Loaded MOSFET, easy to build - Page 1 
 
I think you need your own thread around here, many people enjoy picking your brain about things  In fact, your name came up the other day with respect to a CCS for Pars Counterpoint Preamp. Maybe a mod around here can make that happen (thread split)!