Help on picking smartphone!

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http://androidforums.com – Hi all,i am considering buying a new smartphone(i live in greece)...my phone company gives me a 140 € bonus and i'd like to spend about 100-150 € more.at this price range i saw that the best phones someone could buy are sony xperia u , sole , j and htv one v.(if something hasnt slipped my mind). i was almost ready to buy the xperia j when i thought that the single-core processor it carries may be a problem with the ice cream sandwich.so i would like your help to decide as i am not an expert just to mention i dont care about the camera at all, i just want a respectable phone that wont lag i (General)