Another big brake company currently stepping-up and offering custom and street application is BAER Brakes. BAER is huge in the Domestic car industry. Many muscle machine and street machines either rock BAER or Wilwood. If you are looking for an inexpensive completely forged 6-piston caliper, look into BAER.
They offer a wide variety of packages for today's modern cars to custom applications for builds and projects. Look into BAER, they will cause some noise in the years to come.