I like:
4d6 no duplicates, treat 2 as 0, drop lowest.
This goves very desirable results:
average 12.2
Only 1 in 15 chance for 8, 9 or 11.
2 in 10 chance for 10, 13 or 14
3 in 10 chance for 12 or 15.
Which I absolutely like. 12s and 15s are most appreciated. 10, 13 and 14 a little less. And...