A great great day to buy hard indeed. I am seriously considering buying with all my available money right now. We're flat, I dont think the price is dipping below $200 again, ever. We may be leaving behind $300 and maybe $400 forever within the next 8 months. I am very optimistic of the route we're taking in the not-so-distant future.
While I agree that Bitcoin is probably pretty cheap here,
I would never, ever jump 100% into any investment as volatile as Bitcoin. Or any investment period.
Diversification is a much better way of averaging out your longer-term gains (and maybe outperform, as many others do NOT diversify, leaving the field a little more open...).
Even if you have a lot of money, I would not suggest putting more than 1% - 2% into BTC. Especially if you have a family. And even 1% into BTC is kind-of a lot.