it's wise to never go all in when you are buying bitcoins or any other kind of investment. what i do is i buy with 50% of the money now, and the other part of the money will be used to buy once the price goes lower. if it does go lower, then i can buy even more coins at better price levels, and if the price goes up, then i benefit as well as my coins will increase in value. it's a win win for me.
Its always good to buy bitcoin in small parts, as it allows you more opportunities to buy in future if price drops, and I think this is the best time to buy some bitcoins.