cams?? I am confused

Use to be you only had 3 options for a cam with purple being the wildest (back in the day) Can someone tell me what colors were on the 3 cams and what is the specs. I am replacing the cam in my 340 but I am not sure what to get. I do not want something really lumpy, I would like 1 step up from the stock cam, not sure what that is. Can someone give me some info? I would really appreaciate it............Thanks