Originally Posted by Slaninar

The looks? You're a lucky man. 500$ is an average MONTHLY pay where I live. I believe your bicycle already is better than most commuting bicycles, even in richer countries (like the US). If you feel like improving it further, good: carbon fork, slick tyres. That's about it. Everytihg else will give you a non-detectable improvement, placebo perhaps, but you really will not notice it.