I will reconsider entry when the price returns to $15. My guess is that it will be here by March.
I think the only way you'll see $15 again is if there is a stock split. Next year is looking strong for AMD, even if flash performs poorly.
You might consider writing puts to reestablish a long position. Pick a strike price slightly below the current price, and write for a month out. Keep doing that month after month until you get assigned, and if you don't, you get to keep some cash. You can also buy a lower strike put if you want some insurance from a major drop. This would minimize the risk.