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i find alot of the time if i am using it near to the 300mm end i have to use a fast shutter speed or suffer camera shake,

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Did you try a tripod, resting the lens on a wall or someone's shoulder to steady it, ...It's perfectly normal to need a fast shutter speed when hand-holding a camera fitted with a long lens.

Image stabilization can help but is not a perfect solution; the effect is limited, though you may find you can usually get away with say 1/60 sec at 300mm rather than having to go to 1/500 sec; also image stabilization does not compensate for blur caused by a subject which is moving.

Did you consider the Canon 55-250 f/4-5.6 IS lens which is very reasonably priced (around £200 in the shops) and is probably less of a compromise optically than the "superzoom" type lenses? If you want to replace the Sigma completely, you'll need something to cover the wide end too, the Canon EF-S 18-55 f/3.5-5.6 IS at around £120 would be the perfect partner - but avoid the old non-IS version as it's not noted for its image quality!

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