I will go with a single core processor, seems like the only thing you do that might really benefit froma dual core is video editing, then you will have to be using software that really supports it, if you play games or use software that doesn't explicitly support dual core the other core of the CPU will just go idle or be used at below 30%. So 3.8GHz single core definately. Intel's hyper threading is another reason why you should go there as well.