Charts - price

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I work with images and im looking for a nice laptop with a big screen 17" and nice performance... would like some advices to buy a not so expensive one

 

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budget about US$700- 850 ... i was looking at bestbuy
http/www.bestbuy.com/site/HP+-+Pavilion+Laptop+with+AMD+Turion%26%23153%3B+II+Ultra+Dual-Core+Mobile+Processor/9556296.p?id=1218123847586&skuId=9556296
or
http/www.bestbuy.com/site/Dell+-+Studio+Laptop+with+Intel%26%23174%3B+Core%26%23153%3B2+Duo+Processor+-+Midnight+Blue/9539154.p?id=1218120538238&skuId=9539154
or
http/www.bestbuy.com/site/Toshiba+-+Satellite+Laptop+with+Intel%26%23174%3B+Core%26%23153%3B2+Duo+Processor+-+Black+Onyx/9553949.p?id=1218123210151&skuId=9553949