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Despite what you're probably thinking, you can do a lot with a wedge mounted Nexstar 11 GPS. You are right though, you are going to struggle with tracking accuracy certainly if you want to image at greater than 1500mm for DSOs. You could always do what I did and unmount the OTA from the fork arms and mount it on a solid GEM. This gives you good optics and great tracking ready for DSOs.
The downside of mass produced SCT's is they don't hold their value very well. Your hard earnt $10k a few years ago is probably only worth $3k to $5k now. Sorry to disappoint, but having recently sold my NX11 I thoroughly investigated the s/h market to determine price. But don't let the money get to you. If you're serious about DSO astrophotography you will not batter an eyelid spending +$10k on the mount alone. Perhaps more importantly is will you continue to view the hobby as fun making such a large investment? You simply need to weigh up whats important to you.
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