Might isn't reason enough to wait with buying. In the same way that people expect the price to go down by the first of August, it may very well go up big time. In order to avoid missing out on a potential increase, it would be a wise decision to buy yourself a certain percentage of coins at current levels, and leave the rest of your fiat aside for when the price goes down. In case the price goes up, you'll benefit because you already bought yourself some coins. In case the price goes down, you have enough fiat aside to start buying more coins, but now at discount prices. It will help you in averaging down your initial buying price. It's a win win situation.