The DMI has been showing lower highs on the weekly (a sign of decreasing acceleration) for a while and has just registered another lower high. This could be signaling collapse of the weekly uptrend coming.
My belief is this is not the area to be buying, but instead wait for a swift drop in price to happen first or wait for a break above $470 area. I'm not sure how far down a drop in price could be, but if the weekly trend is over it could be very low like $300. Personally I try not to make targets as one can never be too sure how far something will go.