I have been hearing many rumours about these being implemented and I really think you should.
20k PK Gas MasK: It would be awesome to have a gas mask as a reward for 20k pk's because player killers need gas mask's more than a 50k pk helmet.. It would be useful and encourage more people to player kill.
2000 Spar Hat: Not sure what hat this could be but 2k spar wins is quite an achievment, would be interesting if they added such a thing.
SIDE NOTE: I have been seing people in the city of Era with many edit's of the 12.5k Spar Win hat recently, Black ones, purple ones, ones with hats on top also.. Explamation please?
Thanks.