Need Advice on Digital Camera.

Hi Experts,

I am interested in buying a digital camera which is capable of taking photographs at night as well. For example please see the images in the following websites. I want to take such pictures at night. I need atleast (minimum) 8MP.

http://www.neystadt.org/john/album/L...-Eye-Wheel.JPG
http://www.airliners.net/open.file/1226189/M/
http://www.skyscrapernews.com/london_eye_night1-01.jpg
http://www.inetours.com/images/Tours..._Bldg_0702.jpg
http://www.extrospection.com/archive...e_by_night.jpg

Please advise me what kind of camera I have to buy. Camera MUST NOT be toooooo big. I can spend about 700-800 Canadian Dollars.

These cameras I mention below, do they have this capability?

Sone DSC-H9
Canon Digital Rebel XT 8MP Digital SLR Camera
Canon Digital Rebel XTi 10.1MP Digital SLR
Canon PowerShot G7 10MP Digital Camera with 6x Image-Stabilized Optical Zoom

I will be thankful to you if you could give me advise on this.

Many thanks,

Regards

Sam.