It will be easier to change over the whole axle, it might even be worth changing the bushes as well whilest the axle is off the car.
Without the sensors plugged it, you won't have ABS, but as your car doesn''t have that anyway (what year is it?) it is not worth pluigging them in. If you are lucky the plugs might be in the boot of the car.
Most straightforward swap for the front brakes is 1.6 Almera ones, what are you using the car for? Rear disks are only really needed in hardcore applications.
