My view would be to get a good coma corrector like the Baader Mark III MPCC as it will be a good match for the Canon sensor spacing and really improve images. Re the guidescope, many are hard to aim and I hate aiming with rings - the Skywatcher or ADM guidescope mounts are a great investment as they allow good x and y axis control with simple knobs and are easy to use in the dark and your guidescope will not slide out.
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