Hello!
Namebio reports no sales of NNL.xyz. So, for now I think the demand is near to none... Most domainers will tell you .xyz has no value and you shouldn't invest in it. A good advice is always to stick to .com. I'm not so sure .xyz will have no value in the near future... So, for now, I would say low $xx, for each. In the future, who knows?
Best regards!