Ok so best CC Hq unit (including wargear) in your opinion is?
I'm thinking that any dedicated CC troops will rock their little space elf world. Their toughness is only 4. Pick equivalent points from any ork non-vehicle entry excepting possibly tankbustas and those troops will rock their world. Same holds true for much of the tyranid codex and CSM codex. 45 points per biker to get units that are as tough as a space marine with a 4+ invuln and lack power weapons just isn't worth it, even with fortune. What other unit can be 350 points and only have 10 attacks (14 on charge) and 7 wounds? 350 points of slugga boys is 174 attacks (232 on charge).I'll cast my vote for the Jebike Seer Council. They may not have power weapons, but they sure do a whole lot more besides. Very fast, very resilient, and with the ability to take out anything in the game with little fuss. Of course, you'll be paying out the nose points-wise, but if used well you'll not notice any discomfort.
Termie Command Squads may give this unit trouble, but I see nothing else that may.