I just finished putting a custom brake package together, and these guys are probably not making a whole of $$$ on that kit.
You could do the same if you were feeling crafty:
http://www.wilwood.com/products.asp
http://www.precisionbrakescompany.com/index.asp
Parts alone on that setup is close to $500 with out the brackets, using wilwood 4 pot dynalites, or maybe an older AP 300 4 pot caliper with 13.5 in rotors and aluminum hats would run you about $700... but you have to make your own brackets.