I think that only you know when it's right to start meds. Depends on how comfortable - mentally and physicallly - you are with your symptoms.
I've been taking Requip, a dopamine agonist, since diagnosed over 5 years ago. Works for me. Sometimes have drowsiness, but work around it by either drinking caffeine or timing meds when not doing something critical - like driving alone all day.
My personal choice is to save sinemet for later. It unquestionably works the best - but can (not always) cause dyskinesia. Again, a personal choice. Just make sure you make an educated one (decision).
Best of luck!