Looking to get a Tower PC for 3D modelling and animation software, whats a decent model to go with?

When I was at Uni majoring in animation, one of our lecturers was adament on AlienWare Laptops. I'm looking to get a proper tower. I mainly work on 2D and concept/storyboard work currently as a freelancer, but I want to jump into 3D models to boost my concept art, maybe learning to rig so I can make my own 3D films on the side for festivals and my own art (Im very serious about this).

I don't know enough on the computer tech side to build a PC, so Im looking at something that would at least be a good start. I was wondering if there were any PC models anyone would recommend?

Thank you