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Paul, if you have a copy of the Astronomy Yearbook (doesn't matter which year) by Australians Ken Wallace, Glenn Dawes and Peter Northfield, I suggest that you refer to the Deep Sky Object table (towards the back of the book). It lists nearly 200 objects, giving name, type, RA / Dec, brightness, constellation, and which month of the year they are highest in the sky at 10 pm.
As others have already mentioned, NGC 253 (also known as the Sculptor galaxy or Silver Coin galaxy) is big and moderately bright; you should easily see something through your 12" scope, and it's favourably placed this time of year.
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