Unless you are a trader, I don't think 145 and 149 makes a big difference. I would rather be sure than miss out.
Having said that, now that I have the trigger order funciton, I can always use it, so rather than buy at the current sell price, I can put a trigger for a higher price, and a buy order for a lower price.
I guess there's no real right and wrong in the different approaches, and I'm not sure if my "strategy" is even feasible, feel free to comment.