Got most of the stuff I'm going to need for the big brake change this wk end,rotors,seals,calipers pads,hoses,bearings, ? should I change out the m/c too ?

a 19 mm MC is available which is an improvement over the stock unit.

Depends... are you using stock calipers up front?

A 19mm will give you a harder pedal but it will take more effort.

You mention big and change in the same sentence. If you are going to a larger pistoned caliper up front then you should change to the 19mm

E.