If your thinking of that kit so it would fit under the stock rims, the #1 kit you posted is actually ~5/8" smaller than stock sized rotor, but running a GT(?) 2 piston calipers so I don't see how they can call it a "big brake kit". 2 pistons would help though, how much I dunno...
I think going anything 13" or bigger in the front will require a hub swap like 94m5 mentions, or redrilled rotors. Either way, you'll need new rims to fit over them (17"+)...