These are healthy discussions and not arguments as you think.
Coming to the point, RAM OC is not ameture stuff and not everyone is comfortable with it, or can achieve stability when adjusting. If CAS can be adjusted, same can be done with frequency also. Why not then purchase a 3000mhz kit simply and adjust both CAS and frequency, isnt it?
HP 950 is a new product and the reviews and ratings are pretty solid for the same. I am not a huge fan of HP either as l have had the same share of experience as you, but this one looks pretty good.