Indeed, if the price fall back to the point of 100$ per 1 bitcoin, that would be a good investment. Because the potential of this currency in a current period really unpredictable, but if it goes down even to 300$, I should say it's still improbably really profit investment
don't do it , it's would just hurt you for long time. i have been waiting for long time enough just to see the bitcoin price dropped to $600 or so but now i'm suffering , i have sold the whole bitcoin i have on $800 to $950 and now i'm struggle to set my buy position 
. should i buy right now at $1,200 before the price skyrocketed? or waiting for another flash drop? i really tired and hope you didn't follow my decision .
well if you believed that bitcoin will increase from 2000$ to 3000$ this year, I guess you don't have to worry to buy it now little by little, because even me I know its high but I looked at the future value of bitcoin. Just make sure this time you won't sell until right time to sell your holdings.The rumour about the bitcoin hardfork give a lot of the impact for the price of bitcoin right now.