I have them in 18 * 8, not sure of the offset and there is just enough clearance over brembos. I suspect you may have a problem with 17s because the spokes curve inwards to meet the rim.
And yes, they are light although you can go lighter. I just like them - had a set on my Ibiza back in the 1990's and had the S3 ones refurbed in satin black to match the rest of my dechromed car.