Sell them, use them, exchange them! What will happen if everyone buys but no one uses them but sit there waiting for the next "big number"? It would just be stupid IMO. I have a lot of bitcoins but yesterday I ordered a new computer for example, you might not need to exchange them into fiat, there is quite the extensive list of trades on https://en.bitcoin.it/wiki/Trade

I don't think you should regret selling at $25 because it's better to do something with them than just sit there looking at the preetttyy numbers. Isn't this a growing ground for a bubble?