I will say one thing. I don't now the prices but really and very seriously Avid's are the only ones worht getting. I have hayes maches (in theory the second best) they Suck. They require constant attention and adjustment and loose power at any given time. They also don't use the whole brake (something I just found out) they leave about 1/3 of the brake on the brake base before you have to replace them. I believe Avids and hydro use ALL of the pad.
Like I said I don't know price but if you don't get avids regular brakes are virtually the same.