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I'd probably go with the 80mm refractor. I've only been imaging for about a year now, so others more knowledgeable will probably correct me. I assume the tracking figures you mentioned are with just your camera on the mount as you don't have a scope? There's a weight issue. The 8" F5 newt is reasonably heavy and will be pushing the mount a bit more.
Also the 80mm refractor with a shorter focal length is easier to start with than the 8" with 1000mm focal length. I've got both an 80mm refractor and an 8" F5. I started imaging on the newt but found it a bit challenging. So reverted to the refractor (470mm focal length). It made it much easier to get acceptable pics. After a year I'm only just using the newt again. Also, none of that collimation fiddling. More time to process those beautiful images you'll get.
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