buy btc.
you can buy 0.3 btc now to this money.
if you buy other coins, it doesnt matter which one, you can't have 0.3 btc in long term.
If you buy only btc and then it will stay on 0.3btc for long time no matter how much the price is :^) I would rather to diversify the investment and go back to Bitcoin so you can have spare bitcoin to spend for your needs or rotate that Bitcoin for another trade.