mtbwagon, flush your fluid with a quality DOT4 brake fluid with a higher boiling point and switch to a better brakepad. Some excellent brake fluids to use are Valvoline SynPower, Castrol LMA, and Pentosin SuperDOT4!
Try using PBR/Axxis Deluxe Plus pads with OE rotors from ATE, Zimmerman, or Brembo. Online vendors like GetCoolParts.com and StopShopandDrive have great prices on pads/rotors and offer free shipping as well.
fyi, brake upgrades might require larger wheels. typically, 12" rotors require 16" wheels; 13" rotors require 17". also, some calipers may poke out more than others, so you should print out the template from the vendor/manuf. to make sure it fits.