I have used the juststock one for 1s racing...works great but you need a booster or receiver pack. The 1s is a good option for stock racing because you do not need a booster. But if you are going to get one I would go through someplace like Stormerhobbies.com or CRC directly. The black case is the v2.1..the most current one.
Northern Mini Racers (www.facebook.com/groups/northernminiracers/)
Team CRC - Team Genesis R/C Products - Motiv R/C - Big Head Racing - Team PRCP