I was in the same boat last year with my 450d. I picked up the Sigma F1.4 50mm and later the Tokina 11-16mm. The Tokina is a nice lens and works well wide open for nightscapes. For daytime shooting I stop it down to F6 or more to get depth of frame. The Sigma has a bit of chromatic aberration when wide open but is quite sharp and has lots of aperture.
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