I would probably pick out the best one of the group that's already opened and send it in for grading...and make further decisions based on that.
Ngc was grading Pl fairly early but pcgs just started this past spring . No doubt to get extra money.
To further answer this, PCGS does have a price in the $17.5K range for a MS70PL First strike, but I see none actually listed that came across for sale 9 are listed as existing. I'd rather pay $$3,500.00 to 4,000.00 for a Gold Label MS70, than the premium for a PL or a First Strike. Not to say I wouldn't buy a PL or First Strike if the price were right.