Z0mbi3SVT:
The correct winter tire for your SVT is the 205/55/16.
It's very close to the stock 17" diameter, which will keep your speedo reading correctly.
(Remember, the stock SVT tire is already 1/2" taller than the standard models' tire)
Using the standard models 16" rims is a smart idea since the offset is 52mm.
^^^Meaning, there won't be any clearance issues...unless you try to run the size (too tall) you currently have.
Hopefully the shop will be willing to swap out the 60 series for some 55 series tires.
By the way, here's a good thread to see what other SVT owners are running for their winter setups:
SVTF-Winter Tire reviews