Telephot Lens and digital compact amera

I havd just finished a beginners course with better photo which has been great. I have a Canon 500d 18-55mm. I now would like to buy a telephoto lens and I am not sure at all which of the three below are the best.
What I would like is something light and get really sharp pictures. I would be happy with 200mm focal lenght. Would appreciate very much your input.

Best Walk Around Lens Comparison - Canon 18-200 vs Sigma 18-200 vs Tamron 18-270 - Which one would you choose?

I also need to buy a small digital compact camera to carry in my handbag because I am going on holiday to a country that is not save to walk around with camera equipment. Could you recommend a Camera with a good zoom, image stabilizer, supermacro, and good for landscape. I need a good one because sharpness is my main concern.

Many thanks

Fernanda

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4/1/2011 1:39:36 PM