If you worry about the day to day fluctuations of btc you probably put too much money into it.
I just want to buy as low as possible. A $100 or so difference on the price will make a big difference when I'm buying 10 coins.
Oh ok, well it really depends on where you really see it going over time and in how much time. Even if the 10btc buy doesn't really affect you and you are comfortable about it I would still maybe wait a day or two. Looking at the RSI it seems like it is currently overbought so it might go back to like 360-350.