Can't go wrong with starting with a well tuned bow but the most INHERENTLY accurate fixed blade head that I have ever seen is the Rocky Mt. "Turbo" (now the RM Blitz) followed pretty closely by the G5 Striker, Slick Tricks, and NAP Nitron.

All 4 have the same thing in common, that short narrow ferrule design. I was amazed at how well all 4 of these heads shot even when I purposely tried them on untuned bows or oddly spined arrows to see what they would do.
The Turbos were just plain SICK though. I could group them like field points out to 50 yards and there was simply ZERO variation from field points at any distance and they stayed the most accurate when I tried to MAKE them fly off target.