I'm with Sean on this - the 70-200mm f/4L would give you the best bang for the buck in that price range. Great IQ, excellent build quality, non-extending, non-rotating front element (important if you use a polarizer).
Originally Posted by K1_zav
Really, this is all about aperture. By 150mm or so, the 70-300mm zooms are at f/5, whereas you'll still be at f/4 with the Canon.
If you decide you want more focal length, you can add a 1.4x extender to the Canon for 280mm f/5.6, and even though an extender has a negative impact on IQ, you'd still have better IQ than either the Canon 70-300 (non-L) or the Tamron 70-300 @ 300mm.
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