Thanx Tanya!
I have this camera for over a year now en never had regrets about buying it. I've worked in a store that sells camera's (sorry, don't know it there's an English word for it

) for 1,5 years, so I have some knowledge about it.
The 18-70 lens (sony) came with the camera when I bought it (I thought I had read that some country's had the 18-55 as a kitlens, but I'm not sure).
The 18-200 lens (sigma) is what we call an allround-lens. It has a little bit of wide-angle and goes to telezoom. This way you don't have to change lenses a lot (less dust on your sensor that way!). That's the reason I bought it for Disneyland! I didn't want to waste so much time changing my lenses.
The 10-20 lens (sigma) is what we call ultra wide-angle. That way you can get more of your environment on your picture. For example the picture I took from the Disneyland Hotel. I can even get my own feet on the photo

And the 70-300 lens (sigma) is a tele-lens for taking photo's of things or people that are further away AND for macro (flowers, butterflies, things like that).
The last time we went to Disneyland, I only took the 18-200 and the 10-20 lens with me and that really was enough for me.
My English is far from perfect, I hope you understand it all...

I can put more pics from Disneyland Paris on internet if you like.
I have my own site with a few other pictures:
www.byfiona.nl
The site's not finished yet, but it's a start...