with a capital of 17 bitcoin? you want to get 7 bitcoin. it may even be more than that, but you have to have a commitment, my advice BTC that you use for the new coin trading, because of the new coin trading percentage we get to be 2-7x from the initial price. Do not ever be tempted kind of gambling! 
I agree with you not to try gambling especially to use all 17 BTC to gamble lol. I think you are free to choose the method that is right for yourself,