imo BTC will go down now for a bit
No one knows for sure, it is all sheer speculation (a little bit of this, a little bit of that). But your stash should gain despite the price swings
Yes the prices are quite difficult to predict but the trend looks like slightly going down. It went near to 250 range but after that again started to going down bit by bit. Based on the trend it may go down some more

If the price goes down, I will buy more bitcoins for dollars that I got when it was higher (than it is now). If the price goes up, I will sell bitcoins that I bought when it was in the $200-220 range...
I marry neither dollar nor bitcoin
It is a good strategy of making money even btc prices not going very high.
But one shouldn't buy in big lump sum at one time for this purpose. Just buy small quantities and sell at decent profit and again buy when it go down. Remember there is always some risks in doing this also but it is common in trading.
If you don't go big, you won't get big. And you can always close a losing trade, and buy back cheaper (more often than not)...
Trend is your friend, whether it climbs up or spirals down