6 SMA's (fit to BTC) 9,20,30,50,128,200 (exponential optional)
I've been using these for a while trading Bitcoin and I've found them to be the most useful to me. I replaced the 7 you may have seen in the first set with the 9 as I'm seeing it tested across many time frames quite frequently. The least used of the six is the 30 period, but it does have some influence I've found on the large time frames, mainly the weekly.