Should read Focus ST < 350Z really
There's a couple of folks on here that have done the switch both ways, but however good the ST is (and I'm not knocking it, it's a fantastic all-round hot hatch), it's still basically a warm shopping trolley. Nothing can quite compare to a 2-seat sports coupe with a huge lump up front and RWD. As as only car to ferry the family around in I'd be tempted by an ST (in the orange, please!) but for a car where carrying people isn't an issue then it would be the Zed every time.