Chris, I don't see anything to be disappointed about there
The next step up in capabilities will come from imaging at a dark sky, as it makes it much easier to get good signal. You'll also want to be guiding, as that will then limit what photons you're catching.
One of the take-home points of the thread I linked to was that it's beneficial to match the pixels to the focal length. Even though my angular resolution was pretty high, it's still possible to get good results. The cheapest camera had the edge in sharpness and fine detail as it had the smallest pixels. It was also the noisiest. The other cameras gave cleaner output for the same total exposure time. The workaround for that is just to take more shots
For your ED80, it may work out that the crop chip is better suited from a resolution point of view, but you have to balance that off against the signal to noise ratio somehow. There's also the factor of atmospherics...the atmosphere will only show us what it wants to!