Your lenses are good choices and are great lenses. I essentially used the same lenses for a few years. Late last year, however, I purchased a 135mm / f2. Since then, I've barely used the 70-200. Although you lose the benefits of the zoom, you gain much more light gathering ability. Its also sharper at f/4, smaller and black (so stands out less). I think if you start doing more weddings, some faster lenses would be good options - and would consider the 24-70, an 85mm or 135mm. But other than that, stick with what you have until you clearly identify that something is lacking.
I've been on a flash buying spree over the last year. Bought my latest one last week. It is a Nissin Di866 Mark ii (a decision I made after reading a few comments on this forum - thanks guys and girls). They're cheap - $240. The advantage of it over the Yongnuos is that it offers HSS and I felt this justified the increased price. Played with it all weekend. It works well. On the downside, it makes a funny crackling sound. I initially thought it was broken, but apparently that's what they do.