I would get the 5mm tvp, either from alza or flm. As well as a center diff. As far as the motor goes I would get a sensored motor because I think it is smoother than non-sensored. Examples are tekin 1550kv or 1700kv. ESC could be mamba monster x, rx8 or hobbywing sensored. All capable of handling sensored motors. It is a straight forward build really. The mamba monster extreme can handle the 1717 motor, many use that esc with low kv motors. There are many options for sensored low kv motors such as leopard and poseidon also.

If you are making an XL build, make it right or go home.