Why not go the full hog and get some lighter brakes like the KCNC C7 or the Planet X CNC if you are on a budget. There are plenty of lighter brakes and cheaper brakes. The Sram brakes should work, but if the cable pull is different than the braking won't be optimal.
I write the weightweenies blog, hope you like it My SwiftCarbon UltravoxMy Velocite Selene
Disclosure: I'm sponsored by Velocite, but I do give my honest opinion about them (I'm endorsed to race their bikes, not say nice things about them)