Well, I think I'll go with the TS-OAG9 since I can use it on the ED80, plus it just seems easier to connect. It has M48 thread on the scope side, which goes into a M68-M48 adapter on the Moonlight focuser, and onto the FF/FR of the ED80. I can't make sense of how to attached the Hutech, if I'm reading it correctly it's about US$800 with all the adapters. Bit more than E150 for the TSOAG9.
Now the QHY5 is 64 diam and 32 deep, the ASI120MM is 62 diam and 28 deep, so it seems it would foul the DSLR body. But if the stalk is in the down position, does it clear the body? If so the width of the guide cam shouldn't matter?
Chris and Chris, these photos (
http://www.cloudynights.com/item.php?item_id=2454) seem to show the stalk clears the body in the down position, so the ASI120MM should fit?