As David mentioned laptops are a huge cost if you want the horse power, I bought a macbook pro for over 3000 Australian Dollars when i was working over there for 3 months, dont really use maya alot on it either. I would certainly recommend a desktop system unless you have to be mobile.
Cheers
Custom built W10 Pro 64 bit, Hazwell Intel 5820, Asus X99 MOBO, 32 GB DDR4 Ram, EVGA nVidia GTX1080 Founders Edition, 512GB SSD Primary HDD, 16TB Storage, 27" Samsung 4k Display. Wacom 27QHD, Oculus Rift CV1