Read the discussion in the last page
Although it sounds like Casket Mag might be garbage. I think having the element you want is most important (probably Arc or Void since BHam exists and will still be good post-nerf imo just not god tier). Surplus is excellent for the last perk and I think Speed Reload will be very nice in the middle column given the small mag. Performance Bonus is also nice for the last perk, but getting extra heavy per pack is hard to beat with Surplus. I'm mainly using Spear to DPS bosses, not kill a bunch of trash where PBonus would proc more.
For the first perk, I know that Hidden Hand's value is debated but I've personally seen it give me head shots that clearly weren't headshots when re-watching my saved videos. Frankly I don't believe that Planet Destiny video that tried to claim it was borderline useless. It's not a good test to have some goofball stand stationary while you shoot near his head. It doesn't replicate real game usage.
Besides HH, Outlaw is always decent although once again it doesn't play to Spear's strengths of boss DPS. Personally I don't like Triple Tap especially if you're stuck with a 3 mag since you'd have to crit every shot just to get one extra round before reloading. All of the first perks are debatable I guess.