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i would agree with what chris has said, for the bigger flys 7.5 to 45 mag is fine, for smaller groups, mags of 80 to 100 are advantagous, some groups such as Phoridae advocate slide mounting in which case slides would be prepared under the stereo scope and then examined under a compound scope.

you made a point about digi-scopes, have you ever thought about a triocular dissection scope with a camera on the phototube conected to a monitor? when i first got my brunel zoom scope i ran my olympus camera via the TV to show of my collection to my family