Hi Neil,
Mine would also be The Orion Nebula, or possibly 47 Tucanae.. They were the first two DSO's I ever saw through my two favourite scopes. M42 was the first DSO I ever saw through my little 4-inch reflector -my first scope, and 47 Tuc was the first DSO through my 12" Dob. Both are still staple viewing on any scope outing.
Davin
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