From what I understand (and read since I do not have any mounts with encoders), the absolute encoders for an AP1600 for your situation are probably a luxury. Given that it's a great mount already and you're planning to buy a suitable camera setup for guiding, I doubt they are really necessary.
However, also from what I've read, it seems the encoders make life easier overall and make guiding "work better".
Personally, if I was in your situation and I had the money for it - I'd get the absolute encoders and enjoy it all.
Finally, I'm just "up the road" from you in Flaxton, working on getting my setup built, etc. No matter what you do I'd love to see the setup when you're done.
