G.Skill Trident NEO 6000Mhz CL30 (F5-6000J3038F16GX2-TZ5NR) is also what I went for, seemed to be the 'best' regarded speed before you run into issues or running the clocks lower due to memory controller running at half rate.
Motherboard was meant to be here today but apparently Royal Mail had 'access issues' with the address, more like they just ran out of staff/time
Oh well, CPU hasn't shipped yet so not as if it matters. The only thing I hope for is that the EXPO profiles are actually stable, reading around it can be hit and miss it seems based on the motherboard, my memory isn't on the QVL for the mobo (Asus TUF X670E Wifi Plus), but hopefully it'll just work...