In terms of tools to carry, a multitool, tire repair scabs, extra tube, and a pump are always a good idea. The multitool is the easiest since it's small and would've fixed your handlebar problem right away.
In terms of saddlebag I have no preferences. The helmet is an aesthetic/feel thing. Helmets should all comply with the same safety standard so they're all equally safe. Consider 1. color-black can get hot in summer, orange should be interesting; 2. holes/slits-the more holes in the helmet the more air gets through, so more $$=more holes. As a commuter I don't really care (I wear a cheap $30 helmet I don't have to worry about scratching up); 3. fit-every helmet fits differently, I highly recommend trying out any helmet you're considering.