I doubt it will go 1500$, as you can see it touched 1800$ and it's back and it's rising already 2000$+, so don't really expect it to break the 1800$ mark, if it falls again buy In small quantities, so over a period of time you shall have a good average which will give you good returns over a period of time. However don't be dependent on the dump last time when it got dumped to 800$ and people expected it to dump further, it shot up to 2.5k in a very short while, so buy at every fall, you never know when it shoots up.