I’d normally be recommending an Evil Sovereign at this point, but I love mine for its steepish head angle – it’s DH capable, but you’d be better served elsewhere. Dialled Alpine is more downhill-y but if you’re getting something purely for going down then the likes of a Bagger/ Troof has to be a sensible(!) option.
Of course you could get something outrageous like an Evil Imperial or Nicolai 2MXTB;
Although I would really question the use of a HT for pure DH. I love hardtails, and I love downhillng on mine but a suspension bike is definitely the better tool for the job in the vast majority of circumstances.