I've got the Tamron 18-270 and the Canon 70-300. Each fills a specific need: the Tamron is a great walkabout lens, only one lens is required for a variety of situations; the Canon gives a better image and I use it mainly for bird photography as it it is not very wide at 70mm. Your 18-135 is a good lens (from reviews that I've read) and if you don't mind carrying a couple of lens, you could keep the 18-135 and get the 70-300. As with everything photographic, the more advice that you get the more you are liable to become confused!!!
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