Any little Acho would do...I suppose it would come down to weight as you dont want to overload the mount.
How much weight have you got to play with realisticly and how you going to mount the guide scope....whats the weight ratting for the mount...also take a few KG's of for Photography.
Are you in a dark site..if not you may want larger aperture short tube Acho to help with those dimmer guide stars.
Lots of choices.
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