I dont really get how its possible to sell @399 and only start thinking about buying back today? You had a decent timing window not only to buy back at 0 loss, but even to make some bonus coins.
All my coins were through coinbase. I was going to sign up for an exchange in Jan., but several people told me the exchanges were shady as hell (and what a forecast that turned out to be). Since it was through coinbase, I sold on Thursday night, and my cash hasn't hit my bank acct yet.