Believe it or not, Fast shot is a good sniper trait if your not using vats. This is because the spread on sniper rifles is so minimal, that the 25% decress in accuracy is barely any difference, and you can also shoot faster as well.
If you plan on using Vats, sniper is always a good choice. Bloody mess will increase your damage (And you get to see more blood, FUN!). Plus any perk that increases your sneaking and critical hit ability (Such as Silent Running, or Better criticals and finesse). Lord death is also good, but you have to work for that.