Same situation. My current laptop is about 2.5yrs old. It's not the best one for PP raw photos.
I've added this one in my BH account. Still searching for 30"plus monitor to go with it. http://www.bhphotovideo.com/c/product/1039465-REG/hp_f1l64ut_aba_f1l64ut_z420_series_workstation.html
I've decided with custom build. Here is my spec:
Arrived today. Love the speed
Get some big tower heatsink with two 120/140 fans on top of that 4790K (I have Noctua U12S with dual fan setup) and you can squeeze some more CPU power while maintaining cool temperatures, stability and thermal output
I have mine OCed to 4.6GHz (I could go for 4.8GHz, but that means steep power and thermal draw). Full burn temperature is around 65°C and the cooler is quiet as a breeze (I'm silent PC freak - fanless PSU, low RPM Noctua fans, Fractal Define Case).
How about that W5100? Is it noisy? I've had V4800 until recently. Swapped it for GTX 960 card (with huge heatsink, fans won't start in idle, when temperature is under 50°C), though I lost 10bpp support (but LR doesn't seem to support 10bpp and doesn't use GPU either). But W5100 was on my wishlist too, I was just afraid of noise (V4800 was like jet fighter engine under full load, aftermarket heatsinks were not usable (mATX board, insufficient room in the case).