Definitely the Andromeda galaxy / M31. If your sky's reasonably dark you can see it naked eye in the north, and through a telescope it's bleedin' huge!
I've found that even the biggest and brightest galaxies are surprisingly hard to spot with an 8" because they are spread out over a big area.
It's completely the wrong time of year for them, but Centaurus A and the Sombrero are two of my favourites.
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