Dell M4700 (soon to become M4800), Lenovo W530 are in the $2K (US) price range, well equipped for editing.
Dell has a 3-year worldwide warranty on their "workstation-class" laptops, on-site in the US and some other countries. Not sure if Lenovo's warranty is on-site as well.
A 15-inch 1080p screen is enough for me, for HD editing purposes, but generally, screen size preference is really individual. If you don't plan to move around a lot while editing, an external 24" 1080p monitor might be a better option than a large laptop.
The Mountain Laptop is what I would recommend. Honestly both are close to the same in specs and will definitely handle what you are working with now. However the Mountain laptop is a Clevo shell and would be what I would suggest. I wont commend on my experience with MSI shells here because of what I might say