Oh Great One. I just put 17" ASA6's on my Silver SVT, stock suspension. Looks great. The SVT ground effects give the car a lowered "look". I have no plans to drop mine, even though I dropped my previous two cars.
Lowering the SVT correctly is very expensive and will put stress on other suspension components.
Quoting "Car & Driver"..the SVT is the best handling front wheel drive car in America!
Why mess with that glowing praise.
If you go with 17s, use 215/45-17 tires. You'll be pleased, the car will "sit" perfectly and handle even better than stock.
Go for it! Life is short!