The two best laptops that I think are really good and totally under rated are the HP G2 850 and 840.
The 850 is the 15.6 inch version, while the 840 is the 14 inch version.
They have HP's proper way of centering a touchpad in the middle of the keyboard instead of the middle of the computer.
Also they have 4 USB ports, which comes in very handy.
They also have VGA and Displayport to 4k monitor ability.
The back is also very easily accessible with a complete cover removal with a flip of an unlock switch.
Easy access to the hard drive, memory, and components.
I have a very similar version of the G2 840 the G1 840 and just ordered the new G2 850 recently.
If getting the 840 I would also recommend getting the 1600 x 900 resolution instead of the full HD 1920 x 1080 resolution since the pixels are too small at 14 inches.
The 850 however should be fine at full HD 1920 x 1080 at 15.6 inches.
I also know the G3 versions are out, but they don't have the 4 USB ports, yet still looking forward to the G4 versions in the future.