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Go for FK Highsports if you want good lows. I have them on my 1.2 aswell and they are pretty decent. Another option could be APs which are more "comfy" but will not lower the car as much especially on the rear.
If your old ones are shagged and you got tracking done with them in, tracking will be affected. If the geometry is based on good joints (factory setup etc), you are just getting back to the former "status" by renewing the bottom ball joints.