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hi chris,
looks like you've been with the astro bug! nice one and nice pics.
with a HEQ5 or higher you are probably going to be able to attach your 8" dob tube on top and use that. that will save money on a scope for a while and you may not need to upgrade that at all.
- tube rings for the scope.
- You will need a guiding solution to take longer exposure. this is usually a guide camera and either a guide scope or an OAG.
- coma corrector / field corrector.
- focuser upgrade
I would advise against a RC collimation can be tricky (and expensive). A newt or a ed80 would be a good choice.
Russ
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