250 ETH is a lot of money, Fella, you are a rich man, selling or not selling, i think i can't give you any of advice, this all depends on yourself. But i am very curious, how much money did you cost for this 250 ETH？
Haha, exactly my thoughts 
If you buy 250ETH at (apparently) almost the highest price you were probably pretty rich from the start, or pretty stupid because it was and still is a high risk investment.