If mobility/power is your point (thus laptop, right?), than you can’t go wrong with a Dell M3800. It’s the only serious beater of MBP 15 w/ Retina. QHD+ screen (w/ touch), Core i7 + Nvidia Quadro all wrapped in AL/CF body + docking station available.
I’m counting days waiting for my 5+ yrs old HP TC4400 to die to have it replaced with this gem.
Good luck!