Upgrade the brake fluid, i recommend ATE super blue AND have stainless steel lines installed front and rear, along with some nice pags (EBC, whatever). . .if you still hesitate, then consider a different caliper/rotor setup.
On the baer.com website, they are the first ones to tell you that upgrading to their big brake system doesn't affect brake performance at all. . .it's usually the brake fluid, the brake lines, and the pads. . .rotors just dissipate heat, so unless you plan on doing repeated emergency stops within 5 minutes, do the above stuff and see how you like it (plus, buying the fluid, lines, and pads won't cost more than $200 for all 4 corners, as opposed to spending nearly 1.2g's on a brake kit)
my .02
Suneil