Hi, many thanks for the response. I had a similar response from the web form which I didn't realise had gone through.
I have now ordered the P5. Although it's too big for my wall space and needs, I am planning on going fully custom water cooled eventually so it makes sense to plan for that. Shame about the lack of 5.25 space. I know optical drives are obsolete but I have a nifty 6xsdd hotpluggable bay for that slot. 5.25 bays are useful for other things than optical drives.
Thanks again.