Please recommend a good cellphone brand

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I'm thinking of buying a new cellphone. I've had my Sony Ericsson k800i for a good three years and it served me good, it sill does. The thing is I want to upgrade and cannot decide which brand of phone. I want to stick with Sony Ericsson because of its good speaker sound when I'm listening to music and good camera resolution, but I'm considering into trying a new brand. I'm leaning towards Samsung for a lot of it's model that are WIFI ready but I've become comfortable with Sony Ericsson. HELP!