Which one of these DSLR has better image Quality?

Canon EOS 1000 XS (480$ with kit lens)
Nikon D3000 (450$ with kit lens)
Sony A230 or 330 (around 400$ with kit lens)

All three camera are entry level Dlsr cameras, thats why low in price and in my range too, i'm not pro so it's good way to enter dslr world. Only big difference in the camera above is "live view" in canon. Which doesn't really matter for me. I'm mainly looking for best image quality.

Your suggestion would be greatly appreciated.

Nikon D90 is what I would recommend

All three of these will give you good image quality, what you have to ask yourself is where you are going as a photographer. Take a look at what the company offers in terms of lenses, flashes, cables, as well as what third parties offer for that camera line. Make the choice on where you want to be ten years from now. If you are not going to build your collection of camera equipment over the next ten years go with the least expensive, and save $50 to $80.

I love Nikon! Don't think you can go wrong there! I would also recommend Nikon d90. Amazing dslr for beginner and amateur. The picture quality is amazing and all the manual settings are right at your finger tips. Which makes aperture/speed/iso so much easier to use and understand.

I bought my first dslr in March. I have the Nikon d90 body and 50mm f/1.8 lens. I'm not great or anything, there's so much to learn! I want to be able to take 'professional' looking pics of my friends and family.
Here are my pics.

With the recent crazy price drops on the Nikon D90 and Canon 50D you might want to look into those cameras.

Of the three listed, only the Nikon can use the legacy manual focus lenses, so that would be my choice. In practical use you will not see a big difference in IQ between the three cameras. Choose any of the three with confidence.

(Note that the D3000 is a bit hobbled. It won't function fully with some AF lenses, such as the 50mm f/1.8, etc.)