If you want the absolute best then imo @Vtec6000 is the man.
From what ive heard its not only his knowledge but also the time he will take to tune the car properly, you wont be in and out within 1 and half hours like some tuners.
@Vtec6000 , I haven't used his services personally but I was there when he mapped @LoganK 's old B18C Jordan and I would not even consider using anyone else after seeing him work his magic.