REI is the best for quality and selection. Do you have transport on arrival? If so head for Chaparral Motorsports in San Bernardino or Malcolm Smith's in Riverside. Hour and a half out of LA, but both a great one-stop-shop for gear. Wide selection....LA has London , big city pricing. There is also a big dealer in the vicinity of LAX, but high priced. If you have trouble bike-wise, my brother owns a mobile bike repair including a dyno. Let me know and I'll hook you up....cheers, Bill
Rule#2 "Never go ANYWHERE that YOU are considered a source of FOOD!