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Question: memory pro duo stick for sony cybershot dsc-w290

i need a 8gb memory stick pro duo mark2 for my sony cybershot dsc-w290 camera,what is mark2, what does it mean? then they have high speed sticks,what does that mean,this polnt and shoot camera also can record video at 720p so what is the best memory stick for this camra!! please help! richardreiser@comcast.net