Okay, so 12,800 ASA was a bit over the top. I've settled down now, 3200 ASA with this new camera will work just fine and reduce some of the time it takes to collect the images. It appears that 180 frames would be a good goal for a DSO, giving me more exposure time in less time than the Rebel XT at 1600 ASA.
Here we have a fine globular cluster M12 and a bright open cluster M25. M12 would have had more frames, but I bumped into the mount (wandering around in the dark) and caused the subsequent images to shift over 30 arcminutes. Pooh.