Cool, same here (bought from 1200 all the way down and back up - even got 20K at the 'magical' 450 sat point).  I think in that case you definitely should be taking some profits - in fact you should have already taken some at much higher levels - but I think we all wish we'd have cashed out more heavily on the 90K run... if for no other reason than to buy many more the next day at a 90% discount.

If only market timing could be perfect we'd all be rich!  Well, except for the fact that then there wouldn't be anyone to sell to on the peaks, and no one to buy from on the dips.  So I guess we have to be happy with the fact that there will always be winners and losers - and just strive to be on the winning side more than half the time!