Which lens should I buy?

Okay so last year I got a Canon EOS 500D. I've been interested in and practising photography for 4 years so this was my first DSLR. I need some advice on buying a lens. The camera came with a Canon 18-55mm IS lens. I love it and all but now I'm looking to buy a telephoto/zoom lens. I had my eye on the Canon 70-300mm with a stabilizer but I'm not sure if I should get this as it's quite expensive. Another one I was looking at prior to that was the Canon 55-250mm IS. The build for that isn't as good but I've heard it's a great lens for what you're paying and a good choice to go along with the 18-55mm kit. But the 70-300mm has a metal build and zooms in further so that's an option too, even if it is more expensive. Do you think I should just buy the 55-250mm for now? I want a universal everyday zoom lens. If there's anymore lenses you'd like to suggest please do, I need advice because I don't wanna waste money on a lens that might not be fit for the purpose :-) I appreciate the help, thanks in advance!