My Tamron 70-300mm broke with error 99

and after seeking advice on its repair I have decided to look for a lens to cover the range 28-300 or thereabouts, with a wide angle at the other end. I have a Canon 400D. Do any readers have any advice on matching up the range with a wide angle, so I only need to carry around two lenses at any one time and can avoid keep changing lenses, thus avoiding dust!!?

I have just had my sensor cleaned and am now dreading getting bits on it!

Also, as in my other post about wide angle lenses, are there any thoughts on the weight of a zoom lens? I'm trying to avoid making mistakes and would like to learn from others' experience.
Thanks in anticipation!
Lesley
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