Well, bite the bullet last week on the dell out let.
got a 17R4 i7-6820HK CPU, GTX1080 8Gb and 16Gb RAM, 1TB m2 SSD, and a 1TB HDD and the 1440p screen. It had 15% off the outlet on the day, so I paid £1785 for it delivered, and then I emailed them to say I wanted to return it, and they knocked another £180 off, so £1605 in total
I wanted the 32gb, but I can buy more memory easy enough in the long term.
The temps and noise are not to bad, the TN Gsync panel isn't the best but for the price I can live with it, esp with the excellent warranty.
To buy new from Dell the above was nearly 3k ! due to the 1TB m2 SSD