For now i think it's a good idead for invest to buy 1 bitcoin or more. You can look the price of bitcoin from yesterday is decrease and today increase a bit. i'm sure it will increase more.
Yeah, price as of today is bit higher in compare to yesterday, but I think this is the perfect time to buy bitcoins and hold it for future, as you can expect greater profits at the time of halving.
It would not surprise me if the price would go back to where it was (near the 420 mark).
The way the market was correcting itself so quickly buy new buyers stepping in means there is stable buy support for 400 USD.