which company's digi cam i have to purchased?

I have a Canon Powershot e1(the cute pink-colored one) for 3 years already now and I can say that it has done quite a good job to me. The only con of that model was the 2AA battery which sometimes costs much because I have to buy a new one once or twice a year. But for you, camera choice depend on your needs and where to use it. When it comes to price and features, I would suggest you go with Samsung digicams. You could also try getting a Fujifilm camera 12megapixels, the one with a bigger lens. Or if you want underwater shots, you could buy Olympus digicams.