Summairizing the great suggestions above: Mirror can go on helmet (easier to aim where/when needed). http://hubbubcustom.com/store/prodde...sp?prod=helmir looks pricey but it is nigh-indescrtuctible (you could use it as a handle for a helmet bludgeon). PBSF or similar bright taillight for days when it's foggy, smoggy, or you're riding into the sunset. A front light depends on where you're going to be/when. 2nd water bottle cage, trunk bag or seat bag to carry stuff for repair kit (or a small fabric or plastic case for same if using a backpack). Since in LA, fenders optional. Switch pedals to STB style - easier to walk in MTB shoes than road shoes. Or go platform + straps as suggested. A bell is less ambiguous and multilingual comapred to "passing" or "on your left". Depending on where you commute or touring takes you, you may want tougher or wider tires. My commute has decent pavement, so 23 mm works for me but I prefer Gatorskins. Sunglasses keep grit and bugs out of eyes as well as glare. Small handlebar bag is useful on touring for keeping valuables and small items handy and to hold a cue sheet or map. Go ride and you will quickly figure out what's missing and what can be left home.