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Despite the IS system the Sigma 150 -500mm is not a well regarded lens for image quality, if you must have IS then go for the Canon 100 - 400mm. Alternatively if you don't mind buying second hand there's the 28-300mm IS L
If you do want to use the lens for birding (longer than and faster than the 55 - 250mm) then you're going to have to reach into your pockets, the Sigma 100 - 300mm f/4 is a well regarded lens, or there's the 120 - 300mm f/2.8 which will cost £2K new or around £1K + second hand It's also the cheapest way to a 600mm lens with Auto focus when used with a 2X Teleconverter.
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