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I don't know if i would really buy them new. While they are a hair better than a standard 2860rs they really aren't good enough to justify the HKS premium pricing.  If you are getting a decent deal on a used set, rock on. For new though, I would go GTX waaaaaaay before going HKS2530.  As for the lag on the 2530's I have a pretty oldschool car. no upgraded intake piping, 2.5" turbo back, stock manifolds, and honestly there really isnt much lag after 4k rpms.  It may seem like a bit of a narrow power band, but it really just doesn't feel that hard to stay in it. 2530's + 2.5 intake side and 3" exhaust + MSP manifolds, I'm 100% sure you will not have the kind of lag that reduces your enjoyment. 
  
Antihero
  
  Putting AMS garbage, and $500 ebay wheels on a Z is like  dressing a Victorias Secret model in a Walmart dress and  Payless shoes. You're embarrassing yourself.  | 
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