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Sounds like you need a telephoto lens then...
I'd personally go for the Canon 70-200, they're around £479 at the minute where as the Sigma 70-200 f/2.8 is like £900+ isn't it?
as for the 1.6x crop factor, it basically means the 70-200mm is effectively a 112mm-320mm. On a full frame 70mm IS...
He's not on full frame Dan, It's a 450D.
As said though... What are you shooting?
If you have an f/1.8 i wouldn't get the Sigma 85mm unless you're after quality glass.
I've got the Canon 70-200mm and i can say it is a nice lens to use and the images are great.