Good pads, new rotors (brembo blanks are cheaper then OEM), SS lines, and good fluid (not as critical, but if you are doing lines you might as well).
Like Nailman said make sure you bleed very well. When doing lines you loose a ton of fluid and subies have high a low spots in the system so i like to bleed a couple of times. Remember the order too: RF, LR, LF, RR.
Once it's all together make sure to heat'em up good, aka bed the pads to the rotors. Do some thresh-hold braking at lower speeds then higher speeds till you start to smell brakes, then a few more times. Drive her home and don't stop the car with the brakes, use the e-brake.
I have hawk HP+, slotted brembos, SS lines, Super blue fluid, and speed bleeders on the Auotx RS. I can lock up a tire before the abs kicks! If you can make it to the next autox this Saturday i'll take ya for a ride; the braking power will make you poop!