Well, I went with the Palicomp solution, and have to say so far, it's pretty impressive.
I added the fast turnaround - they're now saying it'll be built tomorrow and dispatched for a delivery on Wednesday!
They also offered an interesting upgrade with a 3-year warranty. However, with that warranty where they collect and deliver, so not RTB, they also throw in a load of other stuff including Win10 Home licence, some OS tuning, cable management, Arctic Alpine 23 cooler, RAM changes from 4x4GB to 2x8GB so have two slots left to up if I want. Also throw in a headset/mic, a card reader and a random set of 5 Steam game keys (
lol).
All for around £1135 inc. Seems pretty good to me