I've seen something like 250, 412, and 5xx something. Need to get an idea what other traders are using for anything past 200.
If you want something beyond the 200 MA I think you would want to go to a longer time frame, say from daily to weekly.
i think if you are looking for something beyond the 200 period moving then you should just move to a longer time frame. you could do the 1000 day moving average but it is the same as the 200 week moving avg.