Almost 9 years have passed since this question has been asked. Technology have evolved quite a bit now and somethings you may want to get:
1) Action Cam
Largely for safety reasons. In case of any accidents, you can have evidence to strengthen your defence or to claim damages against the other party.
These are pretty reasonably priced .. can get a very decent one for less than US$100.
Just remember to buy the mount when buying one. Bike mount is good but if like me, a food delivery rider .. a helmet mount may be more practical
2) Lights - Super bright lights with USB charging
Again for safety reasons. And USB charging cos the prices have come down quite a bit and the battery life have improved too. My battery operated ones are costing a hell of a lot over time ..
I find them very useful for getting attentions at junctions where cars turn out into your lane. Or on pavements, it acts as a "silent bell" to notify the pedestrians in front of you.
3) Rear Mirrors
Low tech and really cheap. No need to keep looking back for oncoming vehicles. May also double up as a reflector ..
Just note that will most be mounted onto (or near) the ends of your handlebars .. you have a slightly wider profile .. so be careful when manoeuvring tight spaces
4) Anti-puncture tyres
In urban riding .. there tend to be more debris like broken glasses .. tiny metal bits .. etc ..
I got sick and tired of fixing punctures .. after I started using my Schwalbe Marathon .. had a peaceful 4 years without any .. and the one I got recently .. I'll attribute it to the thinning rubber after all the wear.