need help deciding which route to go...Thanks

Hello so i am building a 70 dart that i want to be a handling machine. I already have hotchkis sway bars and springs, bilstien shocks and all that good stuff. Now its time for disc brakes on all 4. I originally have 9" drum brakes so here are my three options

Doctor diff route- ($1500-1800) 11.75 " rotors. need to either get larger control arms, and or change my existing ball joints top and bottom with new bushings, (all part of the total picture anyway) Still use heavy rotors and calipers. One piston Calipers i believe???

Ebay- mcb ($1600) Comes with new control arms all ball joints, bushings , bolts and stainless lines pads, master cyl and prop valve, also has ebrake cables. has vented and drilled rotors but only 11". Still heavy and one piston calipers

Wilwood- ($1400) bolts on my front drum spindles, Four piston calipers and everything is light weight. I still have to rebuild my whole front end with new ball joints, bushings, etc . Still need flex brake lines

I am not trying to be a professional race car, but i am not sure how one piston calipers and heavy original weight equipment sounds to me. Any input or advice would be greatly appreciated.
Thanks, Joseph