Scott
Having been through the trials of getting an imaging rig up over the last 15 months, I would suggest trying the 80mm first with a DSLR. The APM is going to need a mount in the class above an NEQ6 with that weight, and while $$$ may not be a factor, a mount in that sort of class is starting to get a tad non portable.
The 80 mm could be guided very easily with a basic guide camera and a 50mm like this and a HEQ5 will work great. If they are tech savvy, then PHD and Backyard EOS will work fine for capture.
Malcolm
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