I managed to get the following discounts and popped a copy of windows 10 on this unit, changing bios to legacy.
15% Unidays (or try claiming your in the employee purchase program 10% and that you were told you could get 10% off, never fails)
10% Goodwill gesture
I purchased the top spec i7 model for £749.99, quidco tracked through at £35.97 used a unidays code for 15% off cost £637. Then I subsequently complained that I'd been advised that the console had an amplifier port on the back like the windows based version and was given a further 10% back £63.60 refunded. After all the discounts and cash back I paid £573. Item comes with a Steam controller and I will sell for at least £30. Incidentally the Steam Alpha R2 does have the amplifier port. It is sat on the motherboard and shows as present under windows. The port is merely covered by the thin plastic and would very easily be removed so access to the amplifier is gained.
Hope this info helps some one. I doubt this listing will go hot.